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Username Post: Electrical short        (Topic#359558)
hinges56 
"3rd Year" Silver Supporting Member
Posts: 50
hinges56
Age: 67
Loc: Canyon Lake ,Ca.
Reg: 05-31-08
01-22-20 09:39 PM - Post#2784941    

1991 S-10 4x4 4.3.
I've been having an electrical problem and it's driving me nuts! It has a new battery and alternator but doesn't charge the battery. It blows my 20 Amp. ignition/gauges fuse as soon as I turn the key. The buzzer stays on when I turn my headlights on but the headlights are real dim. Non of my gauges work but the lights in the dash work fine. When I say gauges, I mean nothing. No gas gauge, not even the speedometer or odometer.
About 4 years ago, I stripped it down to metal and painted it in my garage so I want to keep it and besides, I bought it from my mom after my dad died. I don't really know what I expect anyone here to do since it's such a weird problem but you have helped me with some strange problems before. ("Wipers swipe out of nowhere") (Where's my transmission fluid going"). There are some really sharp people on here! Thanks Scott



 




gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25040
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
01-23-20 05:00 AM - Post#2784950    
    In response to hinges56

You have a dead short somewhere. I had a similar problem tracing a blowing fuse as soon the key was inserted. It was a '13 F150 3.5 twin turbo. I traced back what the owner did to fix two codes. He replaced two parts, coil on plug and cam sensor, from a 3.5 Mazda!! The sensor was easy to find from a receipt and box part number. The coil pack was harder. I unplugged all the coil packs. After inserting they key, the fuse didn't blow. I knew I was close. So plugging one at a time with the replaced coil last. On that last one, the fuse popped. I pull it to check resistance and compare it to an original. Well, the new coil pack had a two prong connection. The original a three prong connection. The original coil pack was installed. The problem causing a misfire was a bad plug.
Follow the same steps. Unplug all the non working items. Using a new fuse, plug in one item at a time. Eventually, you'll find the short. Either a wire, connection, or item are bad. Check all your grounds. Add more too. Check the ECM ground. Engine to frame. Engine to body. Battery to frame. Battery to engine.
Sign up at www.autozone.com. You'll find factory wiring diagrams. The '91 is fairly simple wiring. It is TBI? If so, email me. I'll send you a TBI troubleshooting guide.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 
hinges56 
"3rd Year" Silver Supporting Member
Posts: 50
hinges56
Age: 67
Loc: Canyon Lake ,Ca.
Reg: 05-31-08
01-23-20 09:10 AM - Post#2784969    
    In response to gchemist

Thanks gchemist for your help! You have helped me in the past and I really appreciate it!
I have the original "S-10 models electrical diagnosis and wiring diagrams" for 1991 that I ordered years ago. It just gets a little overwhelming for a plumber. It is a TBI. When the battery is charged, It starts fine and runs good. Could a bad ground be the cause of my problems? No gauges really makes it tough to remember how much gas I have. At least I was close to home when I didn't remember.
Once before I had a similar problem and it was a wire that had rubbed through the insulation and shorted out to a bracket. The big wire cover that holds the loom under the hood has disentegrated so I replaced it but it's really hard to get to it behind the engine/top of the transmission. I'll keep looking. Thanks again. Scott



 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25040
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
01-25-20 06:48 AM - Post#2785125    
    In response to hinges56

hinges56,
A TBI guide was emailed to you. Check all the body grounds. Using the diagrams, disconnect everything on that circuit. Plug in one item at a time. When the fuse blows, the problem is there. If it's still intermediate, wiggle the harness around the fuse box and engine.

So many people have problems with only bad battery connections. Replace the post connections if necessary.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 
hinges56 
"3rd Year" Silver Supporting Member
Posts: 50
hinges56
Age: 67
Loc: Canyon Lake ,Ca.
Reg: 05-31-08
02-07-20 12:20 AM - Post#2786034    
    In response to gchemist

Update! I've been racking my brain, reading the books, and forums, etc. I've pushed and tugged and taped every wire possible. I decide to put the 20 amp fuse (ign/gauges) in again and give it a try. The fuse did not blow, the lights on buzzer did not buzz, the alternator was charging and the headlights were bright as ever! You would think that I'd be happy? At least I know that there is or was only one problem, not multiple problems. When the fuse doesn't blow, everythng works even my gauges, everything! It's been so long since I've tryed putting the fuse in (because I was going through fuses left and right) that I have no idea what it was or how long it will last! Isn't it strange that all of the problems are associated with the ign/gauges fuse? At least now I know that I have a half tank of gas. Wouldn't it be nice if this took care of my problem? A guy can dream can't he? Once again, thanks to all who responded. This might not be the last of this post though! Scott



 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25040
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
02-07-20 05:02 AM - Post#2786037    
    In response to hinges56

Electrical problems can drive you nuts. I fixed a non working 3rd brake light by cleaning the fuse. These old trucks have had fuses in place for 20+ years. Take them out and clean them. Or install new ones.

Good luck!!

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 




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