where to ground?

[Afficionado]

Of course up front i will do the big 3 in my car with an engine ground and what not...in the rear however, is it safe to ground to just the thin sheet metal on the trunk? I thought it wouldn't be sufficient, but my local car audio shop said it was fine. Should i cut a whole in the trunk to ground to the frame? Is sanding and grounding the trunk metal enough? thanks.

[Hugh G. Rection]

Of course up front i will do the big 3 in my car with an engine ground and what not...in the rear however, is it safe to ground to just the thin sheet metal on the trunk? I thought it wouldn't be sufficient, but my local car audio shop said it was fine. Should i cut a whole in the trunk to ground to the frame? Is sanding and grounding the trunk metal enough? thanks.

most people just old school it to the sheet metal. for me though, in my personal vehicles i use another run back to the front for the ground. to me using sheet metal is just half assing on anything above 100amps.

[ROLEXrifleman]

If possible the frame would be great.

otherwise your at the mercy of hoping the piece you sand down to bare metal is truly grounded in the circuit.

[Trey_Dog650]

To the frame. Or floor pan

[Rmichael91]

I typically prefer to do a run back to the front, along with a separate ground in the rear. If possible to the frame or a strut bolt if that's all that's accessible.