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#91064100
Speedway GM Internally-Regulated Alternator Wiring Harness
- Ready to plug into '73 & up GM internally regulated alternator
- Special diode prevents engine run on so you do not have to upgrade to a more modern ignition switch when upgrading to an alternator
- Diode is pre-installed and protected with heat shrink
$38.99
/each
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Product Summary
Universal Fit, 8" Overall Length
- Ready to plug into '73 & up GM internally regulated alternator
- Special diode prevents engine run on so you do not have to upgrade to a more modern ignition switch when upgrading to an alternator
- Diode is pre-installed and protected with heat shrink
- Plug and play
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Return PolicySpeedway Motors 91064100 Details
Speedway Motors 91064100 Details
If you're hanging a common internally regulated GM alternator on your ride, you had better cough up the bucks for this problem solver. If you just wire-up the alternator with any old "parts store" plug you will have a nasty little surprise in store for you... the engine won't shut off!
When wired incorrectly the alternator will back feed juice to the ignition switch and keep your hot rod running. NOT COOL! This harness fixes that problem and will make you the hero of the drive-in.
This adapter plug does not work with "one-wire" alternators. It is not needed. This adapter plug works with GM alternators with the built-in regulator, typically from 1971 or newer cars and trucks, like our 91367163 or 91067150.
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Speedway Motors 91064100 Specifications
Speedway Motors 91064100 Specifications
| KEY SPECS | |
|---|---|
| MFG. Part # | 91064100 |
| Brand | Speedway Motors |
| GENERAL | |
| Overall Length | 8" |
| Sold in Quantity | Each |
| Notes | Not for use with one-wire alternators. |
Ratings & Reviews
4.8
53 Reviews
The product, an alternator wiring harness, is widely praised for resolving engine run-on issues and making alternator updates and conversions simple and efficient. Users particularly appreciated its internal diode, superior to many competitors without this feature, ensuring no backfeeding. Its usability underscores its quality, with customers repeatedly commending the ease of installation and plenty of wiring included, which allows flexibility in routing. Beyond that, customers found the product well-made and of excellent quality, despite some comments on it being a bit overpriced. Moreover, the product's performance is reliable, providing effective solutions to otherwise complex problems such as converting from a generator to an alternator. The product's success implies it could be explicitly recommended to those facing similar installation or conversion challenges.
Ratings & Reviews
4.8
53 Reviews
The product, an alternator wiring harness, is widely praised for resolving engine run-on issues and making alternator updates and conversions simple and efficient. Users particularly appreciated its internal diode, superior to many competitors without this feature, ensuring no backfeeding. Its usability underscores its quality, with customers repeatedly commending the ease of installation and plenty of wiring included, which allows flexibility in routing. Beyond that, customers found the product well-made and of excellent quality, despite some comments on it being a bit overpriced. Moreover, the product's performance is reliable, providing effective solutions to otherwise complex problems such as converting from a generator to an alternator. The product's success implies it could be explicitly recommended to those facing similar installation or conversion challenges.
4.8
53 reviews
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Most Liked Positive Review
5.0
Such a simple product to remedy a mmajor problem
I had installed an internally regulated alternator on my 1955 Nomad powered by a ZZ4 350 SBC and used an auxiliary harness that eliminated the voltage regulator and wired into the existing generator idiot light. The engine would continue to run after I turned off the ignition. Tried to remedy the situation with timing but still had the same problem. Just happened to see this product in the catalog which explained why I was having the problem. So simple to remedy the run on and very easy to install. Will be installing an amp gauge under the dash. Great product.
Most Liked Negative Review
2.0
Be sure before you purchase.
I'm building a car and using a 3-wire GM alternator (internal reg) and kept reading articles about needing this diode in the ckt to keep the engine from running after switch is turned off. I went ahead and ordered this part, installed it, and the diode became very hot when the key was turned on. Removed the diode, started the motor (it shuts off ok), and all is well. Guess I didnt need this part after all.
Filter by Ratings
Easy to use great product.
5.0
9 months ago
13k racing
North Iowa
Verified
Easy way to hook up my alternator.
Would Recommend
Alternator wire
5.0
a year ago
Alternator wire
Omaha Nebraska
Verified
Works as it should!
Would Recommend
yes
5.0
a year ago
grumpy
hudson nc
Verified
I used it as it was meant to be used
Would Recommend
Great quality
5.0
2 years ago
Babaloos pinstriping
San Bernardino ca
Harness installed easy. Quality product.
Would Recommend
Such a simple product to remedy a mmajor problem
5.0
2 years ago
Big Al
Fish Creek, Wisconsin
Verified
I had installed an internally regulated alternator on my 1955 Nomad powered by a ZZ4 350 SBC and used an auxiliary harness that eliminated the voltage regulator and wired into the existing generator idiot light. The engine would continue to run after I turned off the ignition. Tried to remedy the situation with timing but still had the same problem. Just happened to see this product in the catalog which explained why I was having the problem. So simple to remedy the run on and very easy to install. Will be installing an amp gauge under the dash. Great product.
Would Recommend
Excellent product. Simple and has plenty of wire
5.0
2 years ago
Tom Cat
Holts summit Missouri
Verified
Swapped a 1949 Willy's CJ 3 over to a 12 volt system
Would Recommend
Fast an easy,service was great.
5.0
3 years ago
Pita
Scottsdale
Verified
Just a rebuild kit,
Not an exact fit but made it work
3.0
3 years ago
Turbosully
Granite Falls, WA
Verified
Plug doesn't match the denso mini alternator but I still used it and made it work. It's a little on the pricey side for what it is but I guess convince costs.
Would Not Recommend
Only Harness I could find, and its great.
5.0
3 years ago
Colin K
Roy, OR
Only harness I could find for a 10SI, and it has a built in diode so you don't have to worry about backfeeding.
Would Recommend
great product at a great price thanks
4.0
3 years ago
ol toddy
south dakota
Verified
worked as it should
Would Recommend
Showing 10 of 53 reviews