91 Chevy s-10 ground short, 12.6 volts across negative battery post to battery cable, CABLE NOT CONNECTED?
I might be right asked:
(91 chevy S-10 4.3 4×4 ) Click on my name and see my previous question for further information, and yes the first thing I checked was all the gounds/ battery cables. The guages on the dash go haywire, coolant temp goes from hot to cold, oil pressure goes through the roof, etc, not good readings as the ground side is getting positive voltage through it and causing inaccuaricies. The main problem is that the alternator charge goes to nothing. I am getting a full 12.6 volts thorough the negative side of the system with one lead on the battery cable and the other on the battery WITH NEGAITVE CABLE DISCONECTED. I can only make short go away by disconnecting the input ground wire from the block to the ecm (tested wire it is good) . I took out ecm case (cpu under the dash), opened ,and looked inside, looks new, and really doubt this is the problem . My question however is is it possible to have the ecm itself tested? ANy suggestions? I have a short tester/ no luck though and full wire diagram
(91 chevy S-10 4.3 4×4 ) Click on my name and see my previous question for further information, and yes the first thing I checked was all the gounds/ battery cables. The guages on the dash go haywire, coolant temp goes from hot to cold, oil pressure goes through the roof, etc, not good readings as the ground side is getting positive voltage through it and causing inaccuaricies. The main problem is that the alternator charge goes to nothing. I am getting a full 12.6 volts thorough the negative side of the system with one lead on the battery cable and the other on the battery WITH NEGAITVE CABLE DISCONECTED. I can only make short go away by disconnecting the input ground wire from the block to the ecm (tested wire it is good) . I took out ecm case (cpu under the dash), opened ,and looked inside, looks new, and really doubt this is the problem . My question however is is it possible to have the ecm itself tested? ANy suggestions? I have a short tester/ no luck though and full wire diagram
What you are describing is a short in your electrical system. What you need to do is install an amp meter to read the amp flow of the draw. It may show 12 volts, with an amp draw of 1 amp, it will show 12.v. With an amp meter connected just like you have your volt meter, you should have no more than .050ma. If reading more than .050ma, disconnect one fuse at a time to isolate ckt. From there if you disconnected the ckt in question and the amp flow drops, thats the source of the draw. You must use a amp meter to get acurate results.
don’t think it,s in your e.c.m. ……may not yet be in your wiring……..check your starter&solenoid…..see if it,s getting hot……..try all moving part,s first…..they recieve the most abuse….good luck!
Have you actually checked the resistance between the battery negative and the engine block and the body? It still sounds like a bad ground concern from what you say.
The gauges you say act up ground to the engine block. With a bad ground, even a bad body ground to frame, or body to engine more likely, will cause this. Try running a wire from the body to the engine, just to see. You may not have checked the ground strap to the engine.
A few ideas, at least. Good luck.