is grounding ampiliers directly to the battery good or bad?

[CHEMMINS 10+ year member]

You have to ground your frame or your vehicle electronics won't work.

 

[Buck 5,000+ posts]

You have to ground your frame or your vehicle electronics won't work.

He was talking just about the amps. Basically the frame acts as the negative wire for the entire vehicle, but it provides a great deal of resistance. Grounding directly to the battery will provide the least amount of resistance.