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I believe that it turned out to be partially a ground issue. I made a ground from negative side of battery to finder. So my thinking is a ground that I checked may actually be bad.

Ok progress! It's running now between 13v and 14v took it up and down the road and everything held. Seems to drop and 12v when I turned it off started it several times back to back. The speed monitor jumped when turning key on just for a second.

I have no way of checking amps,just voltage.

Ok new alternator. Tried it out flip lights on still drops. Unplugged black abs box. Still drops. I found fuel relay hot it will almost burn you???

Same pully as the old one. Just so we are on the same page. Gas engine.

Just a heads up. I went got a new alternator,the old one squeal and getting hot. Old one was under warranty so no loss of $$ just time,labor,gas.

By the way. With the brake light on the dashboard coming on and off randomly could the anti locking system be the cause?

Ok ill do that next. It may be Thursday before I get a chance to look at it again.

Yes battery tested good.

Ok played with the wires and all again today. Somehow the voltage is holding and truck isn't cutting off. Alternator is whining high pitched noise. It gets hot to touch quick. The big wire off of it is hot though.

Checked all wires wiggled harness. Battery cables good, Grounds are good. Checked voltage at alt. 14 v check battery volts 14v. voltage goes back to 14 at times until lights or fan blower is on. turn both on volts drop to low starts trying to cut off. tryed taking for spin again. same ole thing...

The truck is a 93 chevy silverado k2500 350 cui with a trany over drive.

I'm thinking its a loose wire. Going down the road the door in the dash that clicks when you turn switch on kept clicking over and over. Then got on shoulder of the road were the wake up bumps are the speed,etc goes crazy. And trying to shut off.

Shorted out. I repaired that. Voltage is low even truck not running.

Cable ends are good /clean. The postive side is little rusty but has been that way for some years. I failed to mention that I had a wire that goes to junction block burn into because of wire going from junction block to starter

I have had alternator checked. Battery post are clean. Voltage did run about 14 now about 9 volts. When moving voltage drops causes gages dropped oil pressure gage dropped so low that check gages light come on.engine starts to stall.out

Hi all im new at this so I was wondering if this was fixed? Im having these issue also.