Fiero Headlight power relay mod (Page 2/3)
Eliredandblack JUL 23, 11:30 PM
I had a spare auto dim/temp rear view mirror, so I decided to install it my 88 GT. It’s easy to get lazy when all the modern cars have the auto-dim feature. Didn’t want to drill a hole in the fire wall for the temp sensor, so I ran the two conductor through the rubber grommet used for the radio antennae. The antenna cable is accessible above/near the passenger courtesy light, after you pull down on the carpet -kick panel. I did have to unscrew the wheel line to fish the cable to the front of the car.
Eliredandblack JUL 23, 11:35 PM
I had a spare auto dim/temp rear view mirror, so I decided to install it my 88 GT. It’s easy to get lazy when all the modern cars have the auto-dim feature. Didn’t want to drill a hole in the fire wall for the temp sensor, so I ran the two conductor through the rubber grommet used for the radio antennae. The antenna cable is accessible above/near the passenger courtesy light, after you pull down on the carpet -kick panel. I did have to unscrew the wheel line to fish the cable to the front of the car.
cvxjet JUL 24, 12:00 AM
Maybe the relay could be installed under the dash- The motor power wire splits off before passing thru the firewall connector...That would eliminate the firewall penetration problem.....I will crawl under the dash tomorrow and see what's what......(Wish there was a Fiero in the JY locally........Then I could pull most of the dash out and have access!
hunter29 JUL 24, 06:16 AM
Both good ideas guys..
cvxjet JUL 24, 03:45 PM
OK...went out and did some OMB research (On my back).....yep, would have been smarter if I had placed that relay INSIDE near the C100 connector.....(But hey, being stu-pud kept me qualified as a Federal worker for 35 years(Could have gone for Politician but didn't want to get the lobotomy!)

The C100 connector- especially the Red Headlight motor main power wire- is more easily accessed on the inside....and of course this makes it very easy to find keyed power...

Here is a picture with labeling.......

[This message has been edited by cvxjet (edited 07-24-2020).]

Rickady88GT JUL 24, 06:23 PM
GM used many standard plugs and connectors in cars and truck. Some are for outdoor use and some for indoor use. The c500 is an outdoor plug connector and the c100 is indoor and outdoor. The biggest difference is the goo that is used to fill the cavities from water. I used to shop the yards for extra connectors so I can push out the spade wire connectors and push them into the voids of the connectors in the car. This way you can add moore thru wires to your car. Just write the "changes" or modification/additions in a manual.
Rickady88GT JUL 24, 06:30 PM
I think some cars even have extra wires for different accessories that may not be in your car. So the plug might have a wire on one side without a wire on the other.
cvxjet JUL 24, 07:23 PM

quote
Originally posted by Rickady88GT:

GM used many standard plugs and connectors in cars and truck. Some are for outdoor use and some for indoor use. The c500 is an outdoor plug connector and the c100 is indoor and outdoor. The biggest difference is the goo that is used to fill the cavities from water. I used to shop the yards for extra connectors so I can push out the spade wire connectors and push them into the voids of the connectors in the car. This way you can add moore thru wires to your car. Just write the "changes" or modification/additions in a manual.



Rick, I wondered about doing that....It's just that the goo is really.....Gooey! I think the best setup would be to mount it under the dash- It would not be noticeable unless you crawled under there, and easy to find keyed power.

Strangely enough, I was trained as an Avionics tech in the Navy and fixed Aircraft wiring on S-3 Vikings for 15 years at NAS Alameda (Until they found out I was up for a pay raise and had bought a house- then they closed the base!)...But House wiring and even car wiring is very different....The house wiring is like greek to me!

I actually fixed computers at Atari in 1982...Came up with a fix for one problem in 5 days while their head tech spent 2 months chasing it in his lab......But I could not program a computer to save my life!
hunter29 JUL 24, 08:09 PM
Cvxjet, good work, my back appreciates it ! This makes it really easy, but you have a 85 right ? I would think its the same for my 86, yes ? I know the wire is red so if there is only one I should be good.

Now we should be able to find key power in the fuse panal, or in my case I think I will mount the switch in the ashtray area so its hidden and maybe grab power from the cig lighter.

You all have been very helpful, thanks so much..
hunter29 JUL 24, 08:14 PM
PS Cvxjet, if you should move your relay let me know where you mount it, I'll look at my car tomorrow while I wait for the relay to arrive, if you get to it before me please let me know.