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Old 10-15-2005, 11:18 AM
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Mysterious Power Problems

I have to electrical problems on My 84 GMC Jimmy 4x4 Truck.

1. I have no power when I turn the ignition on to any of the things after my fuse box. (This is the new style) I only noticed it when my aftermarket tach stopped working. What else is controlled after the fuse box? I have traced out the wiring and all seems fine unless it is a fusible plug..and if it is I wouldn't know which one as the wire colour changes. What is my problem??

2. I have no power too the signal lights to the passenger side of my vehicle. The brake lights still work. It is NOT the signal flasher. What is my problem?

Could these too be related?? Any help would be appreciated.

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Old 10-15-2005, 02:36 PM
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can you be more specific on what the problem seems to be ?
I 'm gonna take a stab and guess you have no turn singles on the right side??

this is traced by 1st checking the fuse then the bulbs

if these are ok them trace it from the bulb to the fuse block for a broken wire or a bad socket sometimes a fuse block can become corroded and lose connectivity..
if all that checks ok then it might be in the turn single switch

the turn signal and brake lights although they share the same bulbs (typically) ae separate systems

hope this helps


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Old 10-15-2005, 03:27 PM
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Doc here,

It doesn't sound like fuse links..those usually are "All or nothing at all" propositions..

What it does sound like is one of two things , or both...

Check ALL your harness plugs Especially Bulkhead connectors..and ESPECIALLY if you off road the truck...These fill with mud and water and corrode very easily.

Since you noted you have problems on the right side of the truck, you may have poor ground issues...Regardless if you do or not, I suggest you set up your grounds in this manner...

Your ground should be set up as such, The battery cable ground to any handy bolt at or near the starter, from there, get a battery cable that has 2 3/8 ring terminals on it ($6 bucks at wally mart or auto parts place)

.................................................. ....................................................... ...

Ground that to the frame..From the engine block ground at the starter, run 2 #10 wires, the first to the firewall, and the second to the alternator ground lug or mount bolt...

Get a Roll of Ground Braid, (rat Shack or ACE) run strap from the hood to the firewall, doors to door posts, Radiator frame to frame, Bed to frame, fuel filler flap to bed, Fenders to frame...Fuel tank sender body to frame.

USE proper Star washers,

Sheet-metal screws / bolts and locks,


And burnish ALL the paint and grease from the grounding areas..this will give you a rugged reliable grounding system that will most likely outlast the car...

If the Alternator is powered white Along with the mount, remove both and the hardware, and sand or water blast them back to clean bare metal...then when you reinstall add aluminum wire bonding paste to all hardware and anywhere the mount or alternator touches the block ..

This is electrolysis , the mount is aluminum and he block is steel (what the hell were they thinking?)..that powder is an insulator..

It will ALSO dissolve the water pump impeller like a mild you might want to think about replacing that while you are in there too..(less stuff to pull down again..)

Don't rule out the possibility also that that If the Truck has a trailer hitch, the wiring plug may be full of mud, water or the wires cut and check that also..

Hope it helps!

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Old 12-12-2005, 09:18 AM
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My grandpa has one, one with the 2.8L/carb, 5-speed. It's really slow but ya can't kill it. Anyways a couple years back they had an electrical issue with the battery going dead all the time, and it ended up being the door switch (the little round one that turns on the dome light). I don't think that's your problem but just a fyi not to overlook the little things.
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