Ok I have a 88 suburban (big school bus) as my daily driver and parts hauler and seing as how my GTA isn't running right now I am having to reily on the suburban exclusively.

I am having a problem with the electrical system that I haven't been able to figure out. It all started out of the blue. I was driving down the road with the lights on and all of asuden the buzzer went off and the volt gage went dead. I am not getting any charge according to the voltometer but when I read voltage at the battary I am getting 11.2v so the truck has enough to run but not to stop and start again later. I have replaced the alternator and the battary and still no luck. There was a fuseiable link coming off one of the wires to the alternator and I replaced that with a butt connector so that wasn't the problem. I have been trying to find a short somewere because that is what it seems like to me but I haven't had any luck so far. I would also think that if it was a short that was strong enough to bring the voltage down that much it would have blown a fuse but the fuses in the truck are all good. I am frustrated and at the end of my wits with this problem and need some help.

Thanks

 

PONCHO,

There is a positive power connection at the starter main terminal, and a couple of blue wires are attached there. These wires have fusible links for the first several inches. Check those for damage, as well as the condition of the battery cable and connection stud itself. Check the negative (ground) battery cable and any ground straps and connections on the engine and chassis (especially on the heads or intake).

You have given a basic outline of the problem, but there are way too many possibilities at this point to give anything more than a general idea of what to check. If you feel you have a rogue load that is draining the system, unplug some of the fuses for the accessories to isolate those circuits.

 

That is a really good idea I didn't think of that yet!!!! thanks