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Speedway Economy 12 Circuit Wiring Harness

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Specs
Sold in Quantity:
Each
Number of Circuits:
12
Compatible with GM Column:
Yes
Fuse Block Included:
Yes
Notes
Main harness is over 12 feet in length. Uses spade fuses.
Speedway Economy 12 Circuit Wiring Harness
Speedway Economy 12 Circuit Wiring Harness
Speedway Economy 12 Circuit Wiring Harness
Speedway Economy 12 Circuit Wiring Harness

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Details

Reviews (97)

Q & A (90)

What's in the Box

Info

This harness was designed to offer you all the highest quality components in a package designed for cars with minimum accessories. Each wire is color coded and labeled every few inches.

Our prewired 12 circuit kit will fit all your basic needs and makes wiring a painless process. It is designed especially for the street rod without accessories. It also includes horn relay and connector, turn and hazard signals, dimmer switch connector, circuit breaker for headlights, two flashers, one alternator plug, two ignition switch connectors, plus more.

  • Mainfuse box base is 1-7/8" x 3-11/16"
  • Box height is 3-3/4"

12 Circuit Wiring Harness Installation Instructions (PDF)

Wiring Information (PDF) 

Notes

  • Kit has two flashers for turn and hazard and they are the 2 prong style
  • 30 amp fuse for heat/cool
  • Two 30 amp relays, one each for the horn and electric cooling fan
  • Horn and electric fan both have 20 amp fuses in dedicated circuits
  • Main harness is over 12’ in length to satisfy most applications
  • Headlights are on a 30 amp fused circuit

Customer Reviews

Rated 4.7 out of 5 by 97 reviewers.
RATING BREAKDOWN
97 reviews
5 Stars
70
4 Stars
24
3 Stars
3
2 Stars
0
1 Star
0
RECOMMEND THIS PRODUCT:

Bonkey
Verified Purchaser
Harrisburg,SD

bought it to put in a 1948 Plymouth. Wires are lettered well

April 18, 2016
It's easy to use. Follow the instructions and all is well.
Yes, I recommend this product.
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Rough 59
Verified Purchaser
Verified Reviewer
North richland hills TX

This is a very good product

April 17, 2016
This is a very good harness. I would have liked to have had a built in option for a universal blinker switch but i would definitely buy it again
Pros:
  • Very Helpful Instructions
  • Easy To Use
Cons:
  • No Ford Colum Plug
Yes, I recommend this product.
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RedRyder
Verified Purchaser
Verified Reviewer
Lawrence, KS

Big Bang for your buck

April 16, 2016
I'm building a '34 Ford rat rod truck. This harness is perfect. It's simple and easy and the instructions are fantastic. The wires are labeled. I don't need any frills with a rat rod so this harness suits my needs perfectly.
Pros:
  • Packaged Well
  • Labeled Well
  • Simplicity
  • Great Instructions
Yes, I recommend this product.
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jw
Verified Purchaser
Verified Reviewer
Texas

Pretty good product

April 15, 2016
Good product, easy to understand and install. Minimum issues in the installation process.
Pros:
  • Wires Clearly Marked
Cons:
  • Fan Circuit Not Complete
Yes, I recommend this product.
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John C
Verified Purchaser
Louisville Kentucky

wiring harness

April 03, 2016
I used it for a re-wire project..Worked great and I enjoyed the entire project more because the wiring was great...John
Yes, I recommend this product.
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Ponies4ever
Verified Purchaser
St Louis, MO

Speedway economy 12 Circuit wiring harness.

April 01, 2016
Easy to use, IF you have some experience doing automotive wiring. Did a wonderful job of rewiring my 1970 Camaro! Glad it was available!
Yes, I recommend this product.
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Gordon
Verified Purchaser
North Platte Nebraska

very descriptive 6

March 30, 2016
Very good quality. Easy to use. Very happy with my choice.
Pros:
  • Excellent Quality M
Yes, I recommend this product.
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Bob4703
Verified Purchaser
Verified Reviewer
Easley SC

74 Jeep CJ5 Install

March 13, 2016
Used this wiring harness on a 74 Jeep CJ5. Instructions said to nount fuse box inside the cab on the driver's side. I needed it where I can see it without standing on my head so I mounted it on the firewall beside the wiring opening--probably a dryer location. The wires are well marked and very flexible. The wiring harness is designed to connect to a GM or with adaptation a Ford or Mopar steering column. My Jeep has the original column--turn signal switch external to the column and the switch is on the dash--so the connections would't work. Using the original wiring diagram I was able to make the connections. The problem I encountered was that the wires were too short and had to be pieced to both the turn signals and ignition. An adapter harness would have been helpful and I would have paid extra for the convenience. On p8 the instructions said there was a brown wire providing power to the hazard lights. Never found it so I never got the hazards to work. In the instrucions the wires for the turn signal indicators have the colors wrong. The wires are pigtailed and well marked so this was a minor oops. There is no switched power for the sound system, yet there is a power for a power antenna. There is also no provision for a cigar lighter type power supply. In the times of GPSs and cellphone charging I would think this is a must. I just used the power antenna wire to hook up a couple. I solved both of these problems with some head scratching and thought. This harness was recommended by another Jeep owner, but his had the GM type harness, and didn't experience TS and ignition problems. Considering the initial cost, well marked flexible wires, and the almost error free instructions I am pleased. I give it a four star rating for the TS and ignition wiring, but would give it five if I'd had a GM type column which would have saved me considerable time. I called Customer Service at Speedway and they answered my questions with no hesitations. I'll call them about the hazard lights next week when they are open. Overall I had a good experience in that it solved my problems.
Pros:
  • Good Instruction
  • Flexible Wires
  • Well Marked Wires
Cons:
  • Needs Adapter Harness
  • No Switched Radio Wire
Yes, I recommend this product.
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bs rat
Verified Purchaser
abbot me

this is a great product

March 01, 2016
I'm building a rat rod so this was great
Pros:
  • Well Marked
Cons:
  • None
  • Na
Yes, I recommend this product.
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Cindan96
Verified Purchaser
Aledo,il

So easy a caveman can do it

March 01, 2016
Easy install for any level of experiance in electrical
Yes, I recommend this product.
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Page 1 of 10

Product Q&A

90 questions : 101 answers

1 answers

I installed the 12 circuit economy kit in my 66' el camino and everything works perfect accept i have NO tail lights! I figured out I had no power to the light switch feed for the taillights so i used the feed for the windshield wiper that was not being used. Can i just run a wire from the switch now to the taillights. i did try and connect them to the light blue wire on the light switch cause that was the only wire that had power when the lights were on at the time, but it blew the fuse, probably just overloaded the circuit? not sure.

elcaminosteve
California, USA
March 31, 2015

I installed the 12 circuit economy kit in my 66' el camino and everything works perfect accept i have NO tail lights! I figured out I had no power to the light switch feed for the taillights so i used the feed for the windshield wiper that was not being used. Can i just run a wire from the switch now to the taillights. i did try and connect them to the light blue wire on the light switch cause that was the only wire that had power when the lights were on at the time, but it blew the fuse, probably just overloaded the circuit? not sure.

Answers

April 02, 2015
EricM
The power wire to the headlight switch should be red number 1. If for some reason you do not have power to this wire check the back of your fuse box for a burned buss bar.
1 answers

wiper switches I have wired up the entire harness and everything works perfectly except I can't get the wiper wired correctly. I used the wiper power wire to provide 12V to the wiper. Then I wired two separate 12V switches for the high and low speed connections on the wiper motor. These switches were wired to ground when switched on. The first attempt at switching the wiper on blew the 20A fuse. From what I've read, this is the way to wire the wiper motor, so what I am possibly doing wrong?

throwaway22
March 23, 2015

wiper switches I have wired up the entire harness and everything works perfectly except I can't get the wiper wired correctly. I used the wiper power wire to provide 12V to the wiper. Then I wired two separate 12V switches for the high and low speed connections on the wiper motor. These switches were wired to ground when switched on. The first attempt at switching the wiper on blew the 20A fuse. From what I've read, this is the way to wire the wiper motor, so what I am possibly doing wrong?

Answers

March 24, 2015
EricM
On the wiper motors you will likely only end up with a single speed. Run your hot wire to the motor and also a ground. Then from the S terminal on the motor to your switch and then to ground. This way when switched off the motor will still have power to return to the park position. If powered any other way it will stop whenever the switch is turned off.
1 answers

How to connect courtesy lights and electric fuel pump Hello, I am using this kit in a 40 ford pickup. I have two questions, 1. I have an electric fuel pump. I don't see a dedicated wire for this. How can I hook up my pump? Is there an existing circuit I could re-purpose for this? ie. power antenna? 2. I do not see where I hook up the dome lights to my door switches. Is there an easy way to do this also? Thank you.

Old1940
California, USA
March 19, 2015

How to connect courtesy lights and electric fuel pump Hello, I am using this kit in a 40 ford pickup. I have two questions, 1. I have an electric fuel pump. I don't see a dedicated wire for this. How can I hook up my pump? Is there an existing circuit I could re-purpose for this? ie. power antenna? 2. I do not see where I hook up the dome lights to my door switches. Is there an easy way to do this also? Thank you.

Answers

March 20, 2015
EricM
Depending on your light switch and your dome light. Some of the older pickups the dome grounded to the cab and power was supplied separately by the light switch. If you have the buttons on the door switches where opening the door turns on the dome light normally this is the ground. In that case you will need full time power to the dome light on a circuit such as the radio which is hot all the time. The fuel pump you would want on a circuit that is on only when the key is on and depending on your options the A/C, heat/cool, etc could be used.
2 answers

Flasher Wiring The turn signal switch I’m using has the hazard switch built into it. From what I can tell it only has one wire available for wiring in a flasher, which I’m assuming would operate both the turning and hazard functions, but the kit has two different flashers. Which one should be used?

henney
Portland, OR, USA
February 18, 2015

Flasher Wiring The turn signal switch I’m using has the hazard switch built into it. From what I can tell it only has one wire available for wiring in a flasher, which I’m assuming would operate both the turning and hazard functions, but the kit has two different flashers. Which one should be used?

Answers

March 10, 2015
coupe50
It's already taken care of just plug and play
February 19, 2015
EricM
One flasher is for the turn signals and only has power available when the key is on. The other flasher has power all the time and used for the 4 way flashers in an emergency situation when the keys are not even in the car.
1 answers

Wiper power wires I have your harness and am in the process of installing it. The harness has a wiper power wire coming from the fuse box but no wires for the connection between the wiper switch and actual wiper motor. Is it not supplied in this harness kit?

Ell1217635
February 17, 2015

Wiper power wires I have your harness and am in the process of installing it. The harness has a wiper power wire coming from the fuse box but no wires for the connection between the wiper switch and actual wiper motor. Is it not supplied in this harness kit?

Answers

February 18, 2015
EricM
With all the possible options on wiper motor and switch installation a separate wire labeled as such is not included. There should be a sufficient amount of extra wire from several circuits such as the rear lights and front lights that a section of this normally suffices.
2 answers

I am putting a sbc in a tube buggy with this wiring harness work for me

offroadhillbilly
February 15, 2015

I am putting a sbc in a tube buggy with this wiring harness work for me

Answers

March 10, 2015
coupe50
I use this harness on anything I build less power windows, power locks
February 16, 2015
Tech
This is a universal harness and can be used for just about any custom installation. These are designed to be used with a GM turn signal switch, but can be modified for use with other switches as well.
2 answers

why is the horn button grounded? The car has a Chevy motor and is all 12 volt. The horns do not work. I've tested the horns and they are good; replaced the 20 amp fuse and relay. The switch has one wire from the fuse box witch is hot and another from the switch that goes to ground

3window
December 17, 2014

why is the horn button grounded? The car has a Chevy motor and is all 12 volt. The horns do not work. I've tested the horns and they are good; replaced the 20 amp fuse and relay. The switch has one wire from the fuse box witch is hot and another from the switch that goes to ground

Answers

February 13, 2015
joesgarage2014
the ground is what makes the circut complete and causes the horn to sound. think of it like a starter motor with out the ground it wont spin
December 18, 2014
EricM
The horn button does not carry any power; it is only used to complete the ground signal to the relay. The ground wire goes to the horn button. When the horn button is pushed it completes the circuit sending a grounded source to the horn relay. Once the relay receives the ground signal, it will activate the power side sending power to the horns.
2 answers

Does this harness work with 3 wire alternator I am using a 3 wire alternator with an external regulator. Will this harnes work if i get the pigtail for the regulator and the regulator? also, I have a electric fuel pump running of a relay. Will this be OK whitrh this harness? SBC th350

hdm1984
California, USA
December 02, 2014

Does this harness work with 3 wire alternator I am using a 3 wire alternator with an external regulator. Will this harnes work if i get the pigtail for the regulator and the regulator? also, I have a electric fuel pump running of a relay. Will this be OK whitrh this harness? SBC th350

Answers

February 13, 2015
joesgarage2014
the electric fuel pump relay hot i just used the fan hot wire that is supplied in this harness on my 54.
December 03, 2014
EricM
This harness will work with any alternator configuration. The white #44 exciter wire will run to your external voltage regulator number 3 and 4. Then if you obtain the pigtail the F terminal will go to the right terminal as looking at the back of the alternator and the connection for the pigtail at the top. The #2 terminal on the regulator will go to the left terminal on the back of the alternator. Your fuel pump with relay will work fine with the harness and wire according to the relay instructions.
2 answers

Which terminal does the solenoid power-red wire attach to on a GM starter? I know where the positive battery terminal wire goes and also I believe the ignition switch start-purple goes to the post marked S on the solenoid but I am confused where the Ignition switch connects. (the one with the fuseable link.) By the way I am using a GM starter on a 350 SBC engine.

4868er
Tucson
November 30, 2014

Which terminal does the solenoid power-red wire attach to on a GM starter? I know where the positive battery terminal wire goes and also I believe the ignition switch start-purple goes to the post marked S on the solenoid but I am confused where the Ignition switch connects. (the one with the fuseable link.) By the way I am using a GM starter on a 350 SBC engine.

Answers

January 08, 2015
SPORTYMIKE
THE RED WIRE GOES TO THE "S" TERMINAL ON THE STARTER THE OTHER TERMINAL SHOUD HAVE I FOR IGNITION.
December 02, 2014
EricM
The main power feed wire with the fusible link attaches to the same terminal as the battery cable to enable part of the circuits to have power even when the key is off and out of the ignition. One circuit as an example is the 4 way hazard flashers.
1 answers

alternator exciter wire diode do I need to install a resistance diode in this wire if I'm not using a warning light. I have a GM 3 wire alternator

wutnxt
Oregon
November 27, 2014

alternator exciter wire diode do I need to install a resistance diode in this wire if I'm not using a warning light. I have a GM 3 wire alternator

Answers

November 28, 2014
EricM
If you are using a 3 wire internally regulated alternator from 71 and newer the best problem solver is our harness number 91064100 which has a one way diode. If not the alternator will feed back current and when you turn the key off the engine will continue to run. This harness wires in the exciter wire in the 12 and 20 circuit harness we offer.
Page 1 of 9

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