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Old 05-31-1999, 10:16 PM
RBM
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Now when the failure occurs, you have to determine if you are losing the ground or the power side of that 12v signal that you didn't have.
Split the circuit by using a known good ground for one of your voltmeter leads and probe the 12v signal with the other.
Check the ground by using a known good 12v source for one of your voltmeter leads and probe the ground signal with the other.