Jim Grant's Tech Tips
Blazer S-10, Electrical Problem
Q: I own a ‘91 S-10 blazer, and have trouble with my battery
gauge, everytime I put my turn signal, light's, horn, or reverse lights
on, the gauge fluctuates. I think I have a bad ground, but I'm not sure.
I also have engine static when I turn on my radio. If you have the time
I could use your advice, thank you!
power supply and ground for the voltmeter on your vehicle is shared with
other gauges such as temperature, oil and fuel. If there was a wiring
problem, the operation of the other gauges would likely be affected too.
It may be that your voltmeter is showing some electrical aging and overreacting.
As for the radio, if the noise is only present when the engine is running
then disconnect electrical components that are active when the engine
is running. Items such as the alternator, various solenoids and relays
may be temporarily disconnected with the engine running while listening
for a change in the static heard on the radio. Of course there are ignition
components that you cannot disconnect and still have the engine run. But
this approach helps determine what is not the cause for your radio static.