Added one up front. Used an existing hole and opened up to 5/16”. Used a self threading screw 3/8”& a star washer. Wondering if there’s a spot to do this to the rear of frame?
The factory put grounds on the driver's side A pillar. That would be a good place to start. Any welded to the body panel would be a good body ground. There is a body to engine ground at the firewall, behind the driver's side head of the engine.
You want to use the frame for ground. With this in mind my suggestion would be only one hole.
Pick a spot on the rear frame for a ground cable. Then pick a spot to drill through the trunk sheet metal.
Make a sandwich. Bolt, ground lug from frame cable, car sheet metal, lug from ground cable to amp, and a locking nut.
I can not help with a best location.
The enemy of this method is the ground lugs rusting and not conducting. The best is to use copper anti-seize or di-electric grease (silicone) to prevent salt and air getting between metal layers, and painting over the bolt, lug, and frame or body metal to stop the rust.
Another good step would be beryllium-copper or phoshor bronze bolts and nuts. Those are made for electrical connections for bussing and taps in substations and switchgear, which are also subject to weather and a lot more current than an audio amp will ever absorb. I keep some on hand (leftovers from a past life) and are available at well-stocked suppliers.
I replaced the strap from drivers head to body with one a size bigger. I need to look and see where I could run a big strap to the body in back, pass through the trunk qtr panel rubber plug, or make a ground lug like suggested earlier. I'm just trying to not do too much with no gain and not put myself at risk for rust since I'm up north. Planning on doing a ziebart treatment before winter and cover in wax and oil on that
Since you said it first, I would suggest cables with double wall heat shrink to protect the wire/lug seam.
I could tell you that a "ground strap" is a bad idea where road salt and water are common but have a look at this video at 30:00. This one lasted less than four years.
this is the fastener I used. In the back I may use that premade wire the guy used in that video and put that adhesive line heat shrink tubing on it. I dont drive this much hardly if salt is out. usually have the Saturn running. past few winters have just been cold with 2 major snows
I drill/tap the frame near a body mount location that allows a 3/8" bolt to be threaded from the inside of the frame. Virtually eliminating the chance of stripping threads as it allows tighter connection(s).
I was think of going thru the quarter drain plug. Either way I’d be concerned with corrosion. I live in rust belt
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