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From: Ok! So you don't believe in conspiracies, but will you acknowledge the possibility of there being coordinated activities in secret places? Texas
Where is the best place to ground my amplifier?
You can ground your amp to a screw/bolt that holds the rear middle compartment to the frame. You can also ground it to the seat bolt or if you have a vert you can mount it to the metal that is under the waterfall.
Taken from C5 FAQ Sticky
I just drilled a hole in the floor beside the big storage bin and screwed a big self tapping screw into it, went right into the frame rail.
There's like indents in the floor that come from the back on both sides of the bin so I put the amp on the back wall and ran the wire into the indent and grounded it there. Seemed to be the easiest way to do it.
Thanks guys. I ended up bolting it to the passenger seat. The only drawback is that I have a 10ft ground cable. But it's just a sub so hopefully there's no engine noise.