Products to Compare (max of 3)
X
Compare These Parts
Talk to the Experts. Call 800.979.0122, 7am-10pm, everyday.
Since 1952
in
in
Talk to the Experts. Call 800.979.0122
Shop By
Support
Account
Street Race Truck More... The Toolbox

Mounting a Fuse Block to the Firewall- 1967 Chevelle

8/24/2020

Every old car that I’ve dragged home in the last 25 years has been a wiring nightmare. Add-on glass fuses, unfused circuits, bad splices, un-relayed accessories, I’ve seen it all. When it came time to start figuring out the add-on accessories on this Chevelle, I looked at a few different routes. One of those was to leave the factory harness in place because it was in very good condition and retained the original bulkhead connection at the firewall. This, of course, would still require the addition of new 12V constant and accessory power circuits. For which, I’d entertained adding our six circuit expansion panels. This would’ve been easy enough to pull off, considering the new underdash shelf to locate them

Just a little off the top.

However, that solution still didn’t contend with all the other changes that my car had undergone. To mention a few; One wire, 140 amp, internally regulated alternator, electric fan and fuel pump, air conditioning, simplified dash lighting and instrumentation wiring. When you compounded all the changes and re-routing that the original wiring would need to undergo in order to remain viable, it became clear.

Removing all the wiring from one of these cars is relatively straightforward, especially if the interior is disassembled. Same for the factory fuse block. With both the engine bay and lighting harnesses unplugged, the fuse block simply unscrews with two fasteners. The dash harness comes along with it.

Something old, something new.

The one thing that I really didn’t like about ditching the OE panel, was giving up the clean plug-in bulkhead at the firewall. However, I discovered a way to retain that location for routing wires and keeping a weather-tight seal. This allowed me to keep a semi-factory appearance while eliminating the corrosion hazard that the original connections had. I used a Seals-it Aluminum and Rubber Molded Grommet to create two portals. I did have to open up the original hole both at the top and bottom to create clearance for the wires. Pictured below is the first test fit. After cutting the general shape with a body saw, I cleaned and re-contoured the shape with a drum on my die-grinder.

On the engine side of the firewall, I found that one of the mounting bosses for the new fuse block aligned perfectly with an existing hole/bolt that had held the factory e-brake bracket. This placed the upper mounting hole at the top-center of the new sealing plate.

For the mounting of the fuse block itself, I used socket head (allen) bolts 1/4” x 3.5” long. For all bolts passing through the firewall and the Seals-it flange, a bead of black RTV sealant was used to ensure a weather-tight seal.

Initial test-fit of fuse block to ensure clearance and accessibility.

I found through the process of trying to route and secure wires in original channels, that self-stick insulation makes a great tool. I cut strips of Boom Matt to hold the wires where I wanted them.

Products Featured in this Article

Related Articles

Installing a Speedway Motors Wiring Kit - 1967 Chevelle
by Jeff Karls - Posted in Tech
10/8/2020
This Chevelle project gets rewired with a Speedway Motors wiring kit. Follow along as Jeff guides you through this application, starting with a good mounting location for the fuse box. Learn more on continuity, grounding and relays.
How to Install an EFI Fuel Tank - 1967 Chevelle
by Jeff Karls - Posted in Hot Rod
9/29/2020
A step by step on how to install an EFI Fuel Tank kit in a 1967 Chevelle. Learn the benefits of using this kit including expanded fuel capacity and a 24 gallon tank.
Removing Paint on Car Body Panels - 1967 Chevelle
by Jeff Karls - Posted in Tech
9/22/2020
Follow along as Jeff demonstrates how to strip paint from the body panels of his 1967 Chevelle using a restorer porter cable tool. Learn how to save time by having the panels acid dipped to remove layers of paint.
Redline Radial Tire Application- 1967 Chevelle
by Jeff Karls - Posted in Tech
9/14/2020
Jeff chooses Redline Radial Tires and black powder-coated steel wheels for his 1967 Chevelle. See how he installs the tires with some helpful tips along the way.
Installing a Gear Reduction Mini Starter - 1967 Chevelle
by Jeff Karls - Posted in Tech
9/8/2020
To keep this project moving forward, Jeff installs a gear reduction mini starter on his big block. See how to apply the mini starter on 153 or 168 tooth flexplates.
Lokar Muscle Car Shifter Installation - 1967 Chevelle
by Jeff Karls - Posted in Tech
8/31/2020
Jeff tackles the installation of the Lokar Muscle Car Shifter inside of a factory stick-shift floor pan section. This product won a "Best Interior Product" Award at the SEMA show in 2016.
Installing a Front Runner Drive System - 1967 Chevelle
by Jeff Karls - Posted in Tech
8/10/2020
Jeff demonstrates how to install the front runner drive system by Vintage Air in his 1967 Chevelle project car all while maintaining a simple, factory fresh look.
Installing Automotive A/C Vents - 1967 Chevelle
by Jeff Karls - Posted in Hot Rod
7/23/2020
Learn how to equip your car with A/C by installing the Vintage Air GenIV SureFit Complete Kit. Jeff installs this kit in his 1967 Chevelle while making some vent modifications to enhance the look and direct air better.
How to Mount an A/C Evaporator - 1967 Chevelle
by Jeff Karls - Posted in Hot Rod
7/21/2020
Jeff demonstrates how to install and mount an A/C evaporator in his 1967 Chevelle. Read some tips on how to get a clean factory appearance.
How to Install a Drive Shaft Loop - 1967 Chevelle
by Jeff Karls - Posted in Hot Rod
7/14/2020
Learn the installation process of a drive shaft loop kit in a 1967 Chevelle. NHRA requires a driveshaft loop if you're going to run slicks on the drag strip!
Suggestions
`
Error
X
Note
X
Ok