Awful sound in Subwoofers

[DoubleOB 10+ year member]

Its like a heartbeat, only happen when the car is runnin, sometimes when i start it but mostly when runnin. i turn the volume all the way down and still there. But when im parked(engine runnin) everything's fine. Its loud, this bumps tops the subs, i think. Hope you understand the problem, when i first install the system was ok. In general i'll like to know what could it be before i check all the wiring and settings.

thanks

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[Blados 10+ year member]

check your ground spot first

 

[brad 10+ year member]

sounds like a ground loop

 

[LoudCrownVic 5,000+ posts]

sounds like a ground loop

x2

Check your connections carefully