engine noise/grounding to frame

hi all,ive read some older posts here about grounding to the frame.i finished my system last friday night.drove around saturday and sunday.everything was cool and then monday i get engine noise.havent had time to check it out,but will do that tonight.currently all my amps are ground to the same point(in the trunk).i might try grounding it to the frame.would i have to make a bigger hole in the trunk and run the grounding wires under the car to get to the frame?i have a honda crx

Well considering the body is mounted to the frame i see no benefit of actually grounding directly to the frame. I would just make sure that your grounding point has been sanded down to bare metal for the best connection possible. Do you have all the power wires and RCA's ran on opposite sides of the vehicle as well??

Usually when people refer to grounding to the frame, they mean somewhere on the body of the vehicle that is metal (like as tdsteele pointed out the body is securely connected to the frame). I guess the technically correct way of saying it is "always ground to bare metal on the chassis of the vehicle". Check the Right RCA cable on that amp. Normally when you switch from stereo to Mono you are only using the Left input. And since you said the sound is clean in Mono, then it sounds like the problem is either with the right RCA cable, or the physical input into the amp. You can try running another RCA into that input to see if it makes a difference. How do you have the amps wired? Are you daisy chaining the RCA's, power, ground, or remote lead?Squirrel

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