new amp added ground loop whine

[mikerson]

I recently was paid for an install with a Kenwood KAC7251 amp. It,s not really in the class of the rest of my SQ type system, but it has significantly more power than the amp I was running my sub with. The impact of the bass and the headroom are awesome...until I start the motor, and now I have a horrible high pitch whine which changes with RPM's. I assume it's a

ground loop or whatever. I tried an old radio shack ground fault isolator but it only helped a little, is there any way to completely eliminate the fault and not just cover it up? A common ground point maybe???

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[Horsemanwill 10+ year member]

what type of hu is it

 

[whitedragon551 5,000+ posts]

Ground all the amps to the same place. Make sure its a good ground. And go from there.

 

[mikerson]

what type of hu is it

I'm not familiar with that term, what is a hu?

 

[mikerson]

what type of hu is it

I just realised what an hu is duh...

I have a Kenwood exelon KDC-X915 it feeds 4.5 volts to an Audio Control

Three.1 . Last night I opened up the EQ and switched the jumper from

isolated to chassis ground, it helped but there is still whine