How to Properly Ground a Race Car

[Bobby Fazio]

I have been reading alot about this topic and want to avoid any ground loops if possible. The problem with my car is it still has tons of factory wiring in it so it's a big mess. .

I have a big 0 gauge wire going from BATT- right to the inside fender (wire brushed and bolted, grounding the chassis. I have 2 or 4 gauge wire coming off battery negative going to engine block. Actually I think it is the cam cover but whatever it is, it's the factory spot on the Mustang 5.0. I have a thin strap going from driver side cylinder head to firewall. I don't have a strap on passenger head but the alternator mounting includes block and head on that side so I figure it should be ok.

So what do you ground to where? I don't understand when it is best to ground to chassis, engine, cylinder head, or straight to battery negative. And why would it matter if you ground two things to the same chassis ground, rather than grounding them to two different spots on the chassis? They all return through the chassis back to the BATT-