You'll find this in other threads here, if you search. Seems that the 12V power going to the booster amp is tapped off of the "wrong" side of a lamp switch. The lamp gets 12V power, but doesn't light until the switch is on, which routes the circuit to ground. (Yes, I know, the positive side SHOULD be switched, not the ground side.) Seems they then tap the booster off of what looks like the power side, but is actually the ground side. When the switch is off, the power comes through the bulb (in series) to the amp. When the switch is on, the bulb comes on, but the feed to the amp is now grounded. One guy reversed the wires in the ceiling fan, but then the fan was pulling in when it should have been exhausting. Others have routed a different source of 12V to the amp.
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Marty and Martha
2015 Z-1 211RD
2012 Nissan Titan
Dalzell SC
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