possible ground? help me please

[anarchy57 10+ year member]

I have an Arc kar 400.4 for my speakers, I drilled a hole in the bottom of the trunk and sanded around the hole to use as my ground.

At first there used to a pretty bad whine which got louder as RPM's increased.

After a period of time, the whine went away.

Now, last week, I observed where I grounded the amp, and there was soooo much rust around the hole!!! So I cleaned that up, and guess what? The whine is back!!!!!...just like it was at first.

what do I do?

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[photocrazy8 10+ year member]

that might be the ground from the body of the car to the frame. have you done the big three?

 

[anarchy57 10+ year member]

no i havent

 

[Raisedin305 5,000+ posts]

I have an Arc kar 400.4 for my speakers, I drilled a hole in the bottom of the trunk and sanded around the hole to use as my ground.At first there used to a pretty bad whine which got louder as RPM's increased.

After a period of time, the whine went away.

Now, last week, I observed where I grounded the amp, and there was soooo much rust around the hole!!! So I cleaned that up, and guess what? The whine is back!!!!!...just like it was at first.

what do I do?

How big did you drill this hole? I think it may be you have some sort of leak (the hole allowing water in) and thats where the rust is coming from.

 

[anarchy57 10+ year member]

its probably about .5cm or so wide.

the weird thing is, after i cleaned up that rust, the whine came back

 

[photocrazy8 10+ year member]

maybe a bad rca getting interference from the power wire...