1985 Chevy van g20 305 ci auto tranny
gauges fuse pops, Think I could figure this out if I had a decent schematic.
Resistance from the fuse holder to ground is a dead short with the ignition
switch in the run position open when off.
Have completely remove the instrument cluster and removed wires from oil
pressure sensor, oil pressure switch, air diverter. resistance to ground is
still zero and fuse still pops. Obviously this circuit goes other places
besides the instrument cluster and the sensors but the schematics I have are
pretty worthless. Would appreciate any help I could get. Once I heard
something that sounded like an electric motor run when I put the fuse in.
This lasted for a second or so before the fuse popped.
The AutoZone website has wiring diagrams. I don't remember the exact
sequence but, I believe you have to register, then click on Repair Info,
follow the prompts.....when you get to the right page, the wiring
diagram link will be on the right side of that page.
Problem found, Had a radio installed at Circuit City a while back,
Workmanship was really crappy. Thought as long as I was in the dash I would
redo the wiring for the radio. This fixed the problem. Apparently the gauge
circuitry also feeds the radio lights. New radio did not use the old light
wire so it was just tucked in behind the radio where it eventually shorted
sounded like an electric motor run when I put the fuse in.
Could be a short in the blower resistor, or bad ground
from blower housing to firewall. Blower motor could have short,
disconnect blower resistor. You might want to dummy up a decent
battery powered bulb setup for tracing. Disconnect car battery,
power up suspect circuits with 3 vt battery setup, this light current
won't blow fuses, and will allow you to identify all outlets on power
lead, could be as simple as a jammed cigarette lighter. Good luck
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