1991 Chevy Silverado V8 Two Wheel Drive Automatic 250000 miles
Here is the problem.
My voltage guage on the dash sits around 10 - 12 volts and of course battery light comes on (it seems no
voltage is getting from altenator to battery).
I put a volt meter on the battery (pos and neg posts) and it shows about 12 volts.
I put the negative probe on the negative post of the battery and the positive probe on the wire attached
to back of altenator (engine off), and it shows around 12 volts. So that leads me to believe the wires
are fine between battery and altenator.
But of course once I turn the engine on all it will show is voltage of the battery. Tests confirm no
voltage from altenator (my battery tester and Advance Autos tester).
Now some times the system will correct itself, like if I make a left turn (not right turns), or last night
when I was working on the truck in my driveway (slight incline) he was fine until I moved him back a
little bit in the driveway.
It is not the altenator, I had put a refab in him, but the problem persisted so I installed a new one
last night and the problem still continues. So 3 altenators have been in the truck (the original, the
refab and now the new one).
So this leads me to believe there is a wire somewhere that is swinging against the chasis.
But I have been looking at the wires and all appear to have their insulation on them or are in
These wires I have inspected are in the engine compartment area.
-- Are their areas elsewhere I can check? Would wires in the dashboard cause a similar problem?
-- I saw something talking about the wires going to the starter. I have only glanced at those
wires. They appear to be in good shape and not touching any metal. Is there something else
I should be looking at when inspecting the starter?
-- Is there anything else I am not thinking of or looking at that I should?
I have disconnected the relay that connects to the fog lamps to rule that out. (They are after market)
I have noticed that when I push the gas, the initial incline of the front end will correct the issue and once the truck levels out from that, the problem starts again.
So it seems like a swinging wire, or something making/not making contact.
Can a relay switch cause this behavior?
Or does a relay switch do something else entirely different?
have the same problem?
Monday, June 21st, 2010 AT 11:55 AM