second battery ground question

[Sal]

Honestly the factory grounding spot should be fine even for that many watts. Also, holy Jesus balls. What alternator are you running?

Yeah no kidding!!!! also any pics of the new set up?

[kevin7898]

for high power you are always better off running the ground straight to the battery from the amp, other wise the amp could wreak havoc with the ecm, unlikely but it possible.

[Pickles]

Meh, its only 500w RMS so its not anything huge. enough to make my seats massage my butt LOL