Quote:
Originally Posted by hatzie
You have plow lights. I assume you also have a trailer plug.
Both of those add on lighting systems tend to add all kinds of fun to the equation from installation mistakes and poor workmanship.
Vehicles this old were usually worked over by 16-20 year olds working for U-haul or Ryder or some other hitch dealer out back and Western, Fisher, Meyer, or some other plow dealer up front. I've seen some pretty rough looking workmanship with Scotchlocks and open butt splices to both lighting harnesses not to mention the mess where the main power for the plow is tied in.
I explain to the customer what exactly they're up against and where this could go.
When they say fix it I go to work to clean things up while wishing a swarm of fleas and ticks could infest the undergarments of the damn kid that created my latest cleanup job.
If they beg off I heave a sigh of relief.
When I work this kind of nasty miserable intermittent I try to split things up to narrow down where the fault lies.
1978 Gm Light Trucks are a pretty simple lighting setup.
At the firewall bulkhead disconnect GM engineers thoughtfully segregated the forward and rear lighting are in two separate plugs. These two plugs are even separated from everything else.
You can unplug the front and rear lamp plugs from the bulkhead and reinstall the everything else plug so the cab, engine, etc still get power.
If the flashers work LH, RH, 4-way each in the proper manner with the front and rear lighting plugs removed from the bulkhead then the fault lies after the bulkhead plug.
Plug one of the lamp harness plugs back into the bulkhead plug then plug in the other. With any luck one of them will be infested with the bug you're chasing.
My guess is that your problem is in the Fisher, Western, Meyer, or some other forward lamp wiring rats nest. Not that yours is a rats nest but you would be the extreme exception in this case.
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It must have been a bad connection somewhere in the front wiring harness.
I don’t know where exactly, but I took apart several connections & cleaned
them up & put them back together.
I’ve checked the function several times over the last two days, & it’s working as it should. I don’t trust it yet, so I’ll have to keep an eye on it when I start driving it again. While I was under the truck yesterday, I noticed my water pump leaking, so I’m waiting for that to show up from Rock Auto.
I want to thank you, for your help / advice. It’s greatly appreciated!