I got Pionner system and 2 custic amps and 3 subs. After I install, I got engine noise from speakers when I turn on the AC while I am drinving. When I turn off AC then the noise is gone. I check the grounding and it's good. Does anyone know how to fix the problem?

 

Acutually, your grounding point may be good, but you may want to ground it somewhere else because the A/C is affecting it. It is causing a loop somewhere. Where, actually, do you have your amps grounded? I have my amps mounted in the trunk with my grounding points on the big metal piece behind the rear seat. I had my car for almost 8 years now and never had a problem with noise entering my system.

 

I have a very similar situation and can't figure it out.
I only hear the noise with the A/C or interior fans on. My problem
was introduced with a battery relocation. However, two trips to
the shop that installed it haven't eliminated the problem. Now
they're saying it's a function of the length of the run and the noise
is being picked up from the chasis - BS. This is driving me nuts.
Thoughts?

The setup is dual 2 guage Monster Cable power cables for both + & -.
The ground is to the frame rail in the right rear of the car.
The ground point was cleaned prior to bolting down the - cables.
It's fairly heavily sheathed wiring zip tied to the fram along the
way.

Could it be that there's too much wire? I wanted to use a single
1/0 wire but they didn't have it. I tried disconnecting one of the
ground cables but the problem persisted. I'm at a loss here and will
look into any suggestions you have.

Thanks in advance!

 

I must ask....what exactly are you running that you need two 2awg to run?

--Don

 

That was the suggestion from the shop due to the length of the
run. We could have done 1/0 also but this should be equivalent.
I just wonder if it might not be too much wire that's contributing
to the problem. Anyhow, again, any input/suggestions are welcomed.

Also, if someone has an FSM and can tell me where the A/C is grounded
I would appreciate it. Perhaps that's in need of some cleaning too.

Cheers,

 

Im sorry, but I must still ask, what is it that you are running that you "need" that wire?

--Don