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Electrical problem Turn signal switch
#772317 March 06th 2021 1:02 am
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This old van wiring is make me lose hair lol. So when I got the van the instrument cluster gauges did work but died at one point, I also had no brake lights. In an effort to solve this I replaced the brake light switch, headlight switch, flashers, fuses, voltage limiter and the turn signal switch. After I replaced the turn signal switch all my exterior lights function 100%. I then I installed the headlight switch hoping that would solve the dead instrument cluster, It didn't, I proceed to fuse with the wiring and reseat the fuses, after that the turn signals and flasher don't work, I do have headlights, brake lights and running lights though. The only lights that work on the instrument cluster are the turn signal indicators, brake sentinel and high beam indicator. I noticed when I use the turn signal while the running lights are on the turn signal indicator lights goes dark and also when I pull the flasher. I should also mention that I've completely bypassed the ammeter. I'm not sure what to do next as I've replaced all the switches.

Re: Electrical problem Turn signal switch
Rancho_Deluxe #772323 March 06th 2021 11:20 am
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Having owned Mid-Dodges since 1974, I have had my share of electrical problems, the older Mopars were well known for them. I wish I would of wrote down over the years the diagnosis or solution to the problem. I know several times I had the lights in the dash dimming or turn signals dash lights dimming, and it was always a ground wire. A good place to start is clean all the ground connections on the sidemarker lights, rear brake lights, and driving lights in the grille. Also the bulkhead connector corrosion was a problems with these vans and the fusible link. I am thinking one time is was even the ignition switch causing the problems, another time I had a bare wire in the steering column, where it runs down the top of the column from the turn signal switch.

Re: Electrical problem Turn signal switch
Rancho_Deluxe #772329 March 06th 2021 12:31 pm
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90% of all electrical problems I've come across myself have been due to bad or missing ground connections, the other 10% have mostly been broken wires either completely brittle and broken in half or broken inside the insulation and sometimes faulty switches. Best advice is break out the multimeter and start chasing wires and testing continuity from one end to the other.


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Re: Electrical problem Turn signal switch
Meanmachine #772337 March 06th 2021 2:48 pm
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Yeah, I'm trying to figure out where the grounds are, it doesn't help that there's a bit of a hatchet job with the wiring. There's a ground wire labeled G11-18 W/BK for connection point E for the instrument cluster connector, Do you know where this goes because I cant trace where it leads without unwrapping all the harness tape?

Re: Electrical problem Turn signal switch
Rancho_Deluxe #772340 March 06th 2021 3:35 pm
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Nope, sadly that's the best way I've found is unwrap, chase them down.


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Re: Electrical problem Turn signal switch
Rancho_Deluxe #772376 March 07th 2021 12:46 am
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[Linked Image]

Well I figured out where the ground for the instrument cluster goes, it connects to the headlight dimmer. I examined the bulkhead connector, seems ok. As far as the ammeter bypass, I have the positive going to starter relay then to battery, and the bypass from the relay through bulk head to black alternator wire. I cut the old black and red wires and spliced them together on the interior of the bulk head. I didn't use any fusible links (I know bad) I attached a diagram of what I did. The circuit board seems ok, don't see any cracks in the copper.

Last edited by Rancho_Deluxe; March 07th 2021 12:47 am.
Re: Electrical problem Turn signal switch
Rancho_Deluxe #772387 March 07th 2021 2:57 am
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So I just went out and tested the lights and discover another odd thing, when I use the turn signal the lights get brighter but they don't blink?

Re: Electrical problem Turn signal switch
Rancho_Deluxe #772388 March 07th 2021 8:23 am
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I think you have a grounding problem. Is there a 4-way emergency flasher switch under the dash. I think it looks like a small silver canister that plugs in to the system.

Re: Electrical problem Turn signal switch
Meanmachine #772398 March 07th 2021 5:15 pm
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There's actually 2 of those canisters under the dash

Re: Electrical problem Turn signal switch
Rancho_Deluxe #772407 March 07th 2021 6:17 pm
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Originally Posted by Rancho_Deluxe
There's actually 2 of those canisters under the dash

Those are your flashers, replace them both, they're a cheap piece of mind. That way you know you have new ones, keep the old ones for spares in case that doesn't fix the issue. If it does fix the issue, toss those old ones.

I always check fuses and bulbs first, then on to swapping flashers and relays next, then chase wires and test with multimeter.


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