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Guest Message by DevFuse

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the wiring sins of my forefathers

wiring harness dash console repair brat 1979

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6 replies to this topic

#1 jimhickcox



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Posted 08 December 2017 - 04:17 PM

I've had my '79 Brat for a year or so and, as you'd expect, things occasionally go wrong and then I yell at the car with a wrench and then it's okay again, generally. Right now my biggest headache is a series of minor electrical issues, which for a while had my headlights not working, but since I got them on I've been mostly ignoring. My horn won't beep, though, and that's going to be an issue come inspection time in February, so it's time to deal with it.


In my adventures around the guts of my car I've found lots of electrical dead-ends and strange fixes to issues that must have come up years ago, so this seemed like the time to trace out my full harness and see what's actually going on. I diagrammed out all the wires between the battery and the firewall, so now I need to get into the cabin and track the dumb wires around under the console.


Does anyone have any sage insight on any of this? Particularly if there's a good way to get under there without making pulling the dash apart and reassembling a major project on its own? Should I just give up and run more wires as my whims suggest and leave vestigial cabling everywhere like people have been doing for nearly 40 years?

#2 Grisezd


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Posted 08 December 2017 - 08:13 PM

I’m afraid that I can’t be much help but I admire your style of writing. I’m in a similar situation with my 78. So far I’ve found that I can get to a lot by pulling the instrument cluster. Between that and crawling under the steering column it’s all there. Pulling the steering wheel will get you to the horn wiring. Good luck!

#3 sparkyboy


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Posted 08 December 2017 - 08:56 PM

It could be that the horn itself is just worn out, try power probing it or testing the wires with a multi meter and having a buddy hold the button down first before taking the steering wheel cover off.
I ruined my horn on my old Camaro back in 96 when the avalanche won the Stanley cup haha!

#4 moosens


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Posted 09 December 2017 - 01:58 AM

Factory service manuals with wiring diagrams online. I even have the good old paper version. Let me know if you want one. I don’t have a working scanner these days.

The fuse box itself , and it’s grounding , can often be an issue. Fuses can look good but when removed you’ll find they can be pulled apart as they have separated but when in place look fine.
Just a couple of things to consider while hunting around.

#5 Rust


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Posted 03 January 2018 - 12:16 PM


follow the "red" wire if you want to continue down this rabbit hole Neo.

#6 Subasaurus


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Posted 04 January 2018 - 05:25 PM

glad to know someone near me has a 70's Subaru.


my vehicle also had a few strange things going on,


- the 12v positive on the electric fan would switch to negative when it had a load (the fan) but the wires woudn't short or blow any fuse when you would touch the 2 wires together, just capped it and ran new wires like most of the electrical on the vehicle, looked like original wiring too so don't know what was happening there.


- same goes for the ignition coil, fuel pump. vehicle has 3 new relays, or should i say the only relays since everything electrical was acting so strange.


- when i was driving down the road the headlights would get brighter then dim down every 10 seconds, ran a new ground to the chassis and block and that fixed it.


- still haven't fixed the issue with the tachometer though, colder days it likes to read double to triple the RPM's, then read correctly after warming up whatever the tach needs warming up, then after about 45 minutes later i guess what warmed up is overheating now? because the tach then shoots all the way to 6,000 and stays there for the rest of the day, its kind of hilarious. and for some reason the fuel and temp are also connected to whatever is going wrong because those read only when the vehicle feels like it.


- Different distributor since the computer thats attached to the coil that reads the magnetic pick up in the distributor was shot and would only work for a few minutes, ended up switching to a points type distributor from a 75 Subaru, works great, just gotta service the points every 5,000-7,000miles.


pretty much everything electrical was going wrong with the vehicle unless i ran a completely new circuit, makes you wonder what will happen to all these newer cars 30 years from now.


-- Forgot to mention! the tension tabs that hold the fuses are usually pretty weak by now after all these years, try giving them some tension, to all of them. loose fuses will cause some weird stuff to happen, including fuses blowing since theres more resistance present in the circuit, even though theres nothing wrong with that circuit besides the fact that the fuse is barely making contact with all the corrosion and such, something a meter will read as good continuity, but under load is a different story.

best of luck!

Edited by Subasaurus, 04 January 2018 - 05:36 PM.

#7 skinny664521903


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Posted 16 January 2018 - 02:03 AM

Been doing a lot of wiring fixes on my 80 brat. These seem to be the correct wiring diagrams. I have the ones from the haynes manual if you want those as well but I think these are more accurate. Happy to see another Texas Brat!

Also tagged with one or more of these keywords: wiring, harness, dash, console, repair, brat, 1979

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