Question about Rockford Fosgate P3001 Car Audio Amplifier
Then it's a bad ground. Where did you ground the ground cable to? Is it tight, free of rust, clean, and most importanly, bare metal and free of paint?
Posted on Nov 02, 2006
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Posted on Jan 02, 2017
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It's likely that the amp is defective but you should check the shield ground of the RCA signal cables before sending the amp off for repair.
Disconnect the RCA cables from the amp.
With your multimeter set to ohms, measure the resistance from the outer shield of the RCA cable to chassis ground. If it's more than a few ohms, that could be causing your problem.
If this is higher than a few ohms, short the meter's leads together to make sure the meter will go down to 0 ohms.
To check the shield ground of the head unit (assuming that the head unit is driving the amp directly), disconnect the RCA cables from the head unit and measure the resistance from the RCA output shield to the case of the head unit. It should essentially read 0 ohms.
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