Engine Noise due to ground loop or amp?
Like many of you, I need to install an amplifier before I can install my carPC. I had Circuit City install a cheap amp I got off eBay today and the guy told me that there's a lot of engine noise and he told me that the amp sucks.
First off, I know the amp sucks but it's a means to an end. But he was right about the engine noise, there's a lot of it. When I am not revving the engine, there's a very loud hum. When I rev the engine, the engine noise gets louder and is on top of the hum that's already there. Needless to say, I can drown out the engine noise by turning up the volume when listening to music.
When he told me that there's a lot of engine noise, he blamed it on the fact that the amp sucks. I always thought engine noise had to do with poor grounding of the amplifier. He also suggested I buy a better amplifier (from Circuit City of course) so that these problems won't happen.
So now I come to you guys for help. Is he right? Is it because the amp sucks? I don't think this is the problem because members here have bought cheap Pyramid amps for $20 off eBay.
Here's what I think. I think he did not ground properly and so I'm getting very loud engine noise. But he is blaming the engine noise on the amplifier.
What do you guys think? If the amp is to blame, then I'll just have to dip into my carPC money and buy a quality amp. But if the problem is due to his poor installion then I want to fix it myself.