View Full Version : Wiring Harness thru Firewall - Ideas?

07-11-2005, 08:34 PM
I am installing an aftermarket complete wiring harness in my 69 camaro. I smoothed the firewall completely. I am looking for some ideas for running my harness from the fuse block to the engine compartment. Seems like there would be a cleaner way than drilling a hole, installing a grommet and routing the wires. Any cool ideas / pics? Thanks

07-12-2005, 08:59 AM
I bought some plastic pieces that go thru the firewall on one side then, thread a "nut" on the other to hold it tight. I believe the send a little plastic sleeve to make water tight. I will check tonight and let you know where I bought them from.


Charley Lillard
07-12-2005, 11:37 AM
The Mule and Malitude have a military type multi pronged type plug that threads together. Neither car is here so I can't show you a pic. Someone else might have a pic though.

07-12-2005, 01:26 PM
Here are the ones I bought. Will be doing my wiring in about a month so not sure how good or bad they are. I think they also sell something similar to what Charlie described.



07-12-2005, 02:07 PM
The Mule and Malitude have a military type multi pronged type plug that threads together. Neither car is here so I can't show you a pic. Someone else might have a pic though.

Like cannon plugs?

07-12-2005, 02:30 PM
See if you can run the harness through the firewall behind the fender where it will be out of sight. Look for areas like that. Good luck,

07-12-2005, 03:43 PM
The Mil-Spec bulkhead connectors (as in the pic, and what Charley described) are the neatest way to do it and allows easy harness removal down the road. It takes quite a bit of up-front effort though to solder all the wires to the connector pins.

The only bad part is if the seals ever fail and moisture gets in them, they can corrode and cause you a lot of grief; one way to stave this off is to pack the sucker with a dielectric grease before assembling the halves.


Charley Lillard
07-16-2005, 09:55 AM
Here are pics of the Mil Spec connector in the Malitude. You can buy them from Mike Brown at Wires and Pliers, 810-229-9688

Address: 8415 McClements ...
Brighton, MI 48114

07-16-2005, 05:32 PM
MIL spec, AKA... "Cannon Plugs"

They can get a little expensive, but there is nothing better for a multi-pin connector. One of the best thing about them is, that you can get connectors with different wire diameters within the same plug.... now thats flexability.

07-21-2005, 06:52 PM
I snagged a coulpe small ones from my last job not enough for a car harness though. I been searching for a supplier of those things. Thanks for the link. I guess my ideas aren't that far off. hmmm Guess I need some new ideas.

08-10-2005, 10:19 AM
A bit of advice about through firewall connectors:

The Cannon Connector I use is a MIL-Spec Connector, anything with a MIL-Spec rating is expensive. I had a hard time getting hooked up with a supplier for these connectors. These Connectors can be ordered in a variety of sizes and pin configurations.

These Connectors all have crimp type pins that must be crimped by the Crimp tool offered by Daniels Manufacturing. If you try to substitute the crimp with solder, you will have problems. Soldering a wire makes it brittle and when you move the harness with soldered pins the wires will break off in the pin. I had this happen when I first started working with these connectors.

http://yellowbullet.com/Gallery/albums/Sparky/Nicky_Motta_Bulkhead_Connector_01.jpg http://yellowbullet.com/Gallery/albums/Sparky/IMG_0896.jpg


This connector is an Amphenol connector, it is not the same type of connector as the Cannon. Most of these types of connectors are solder type connectors. The problem with these types of connectors, I think was mentioned in an above post, is that moisture gets into the connectors and you have corrosion issues. Furthermore, these connectors usually come in an attractive army green color, which I wouldn’t think would be so eye appealing on a smoothed firewall..(LOL)

08-11-2005, 01:04 PM
You can order Amphenol MIL connectors online at:http://www.newark.com/
Another option I use all the time at work is AMP (http://www.amp.com/) Plastic (metal available) connectors. You can get these at Newark or http://www.digikey.com/. I have not used them outdoors, but they might work and are much less expensive.