> The very first thing I'd try is to upgrade the stock harness ground
> (didn't see you try that) - heavier gauge and to a known good ground
> point (sand away any paint so you get down to clean metal against
> the ring connector on the wire). Snip the ground wire immediately
> after (1.5-22 or so) the plug/socket on the car harness, attach your
> heavier wire there. No harm done to any stock things...

Good point, will do. Thanks

-brendan