Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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the numbers you gave us, are they amps or milli amps??
ok, first, use the amp portion of the meter. use a scale around 3 amps. you are looking to have only 50-75 milli amps as a draw.
once you insert the meter in line, let it rest for 5 minutes so the modules can go to sleep and then look at the draw.
your red lead is in the wrong slot. move it over to the ma slot and your black in the ground. then you have it set right
yes to the red. the black is fine where it is. yes, the negative cable off with the meter in line
check the fuse in the meter to be sure it is good. it is inside the back case.
you can use the other port but there is no protection to your meter from a voltage spike
the draw from the radio is most likely the culprit. the display is a module and most likely will cease to pull current after it goes to sleep.
you still have not told me if the numbers were amps or milli amps??
ok, thats new information not provided.
have you tried putting the radio fuse back and leaving out the display fuse??
the common denominator here is the bcm. try unplugging the bcm and see if the draw goes away.
yes, the bcm controls all body functions. both items are controlled by the bcm
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.6 volts overnight??? not really. there will always be a small draw to keep some modules alive.
thats why 50-75 milli amps is normal. it is a draw
how are you making out
did you have it flashed to your car???