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drifterboyE3 11-04-2012 07:50 PM

Bad ground??
Hey guys just installed my subs and I have a hmmming noise that changes with the rpms. I have my rcas run down the passanger side threshold and behind the rear panels(zx3) and my power and remote is run under the drives side threshold. And I'm grounded at the lower bolt on the drivers side rear seat mount. I used a wire brush to scrape paint but do you think I could still have a bad ground? Any advice would help thanks

sleepyboy 11-04-2012 07:52 PM

Welcome to the forum [welcome] [ffrocks] [loveff]

Definitely sounds like you have a bad ground. Try moving the ground to a different location and see if that resolves the problem.

drifterboyE3 11-04-2012 07:57 PM

Where would you suggest. The person before me had subs and already had one ground wire under the rear seat but that yielded the same results

sleepyboy 11-04-2012 08:01 PM

I dunno, I actually grounded mine in the same spot as y'all now that I think about it. You may want to check all your grounds underneath the hood and make sure the battery and the motor are properly grounded and getting a good connection. Also depending on what car you have some have little resistors or noise isolators that are supposed to the do the same thing. I've replaced mine on my focus before though the noise it let through was very small and almost unnoticeable.

sam fisher 11-04-2012 08:39 PM

i grounded in the trunk under the car . at first i just used sheet metal screws , but later on i drilled a hole and bolted the mofo in lol.

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alaskanzx5 11-04-2012 11:02 PM

the seat belt bolt has paint on it to. get the paint off of the bottom side of the bolt and try that.

Now534 11-05-2012 01:04 AM

What do you have for a deck? Pioneers (i know some older models do this not sure on the newer models) have a Pico Fuse internally that when it blows will create engine noise through the RCA's. Easy solution to this was to wrap a wire around the plug on the RCA out (then plug the rca in to the back of the radio) then take the other side of the wire and wrap it around a screw in the back of the radio (pick one there are a few).

freemind 11-05-2012 04:07 PM


drifterboyE3 11-06-2012 07:46 AM

It's a deh3900mp I believe. And yes I had that problem before wires touched and blew the ground. So I got a new deck(same one) and that solved the problem. It's just now that I put them in the focus. They were in an escort

Now534 11-06-2012 07:59 AM

It's worth a try to fix. Its easy if you have scraps laying around

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