What if im not comfortable drilling into the body? What are some other good grounding points? currently I have my screen and headunit grounded to the same OEM Radio Harness ground. with A LOT of RCA cables running around it, and of course getting a fair amount of whine, a lot more when the laptop runs on battery instead of the inverter. It also comes and goes depending on where I am and how fast I am going (or maybe I'm turning the stereo up too high and cant hear it anymore.)
I have a 98 Honda accord if anyone has the same and can recommend some good ground points that dont involve drilling.