Open pass door, remove 'Body by Fisher' sill plate, remove carpet stiffeners.
See the wide trough?
This is where I ran the cables from the kick panel to the trunk.
Out of the way and protected when all removed items are reinstalled.
It is best to run a separate neg cable back to the battery.
But, you can cabkl from eng block to subframe and body and cable from a welded bolt on the unibody/trunk to battery.
Follow NHRA General Guidelines in mounting the battery in the trunk.
I used 3/8 threaded rod and bolted the rods through the frame rail using fender washers outside and a nut & lock washer for the battery box/frame inside.
Install battery, slap on a 1.5 -2.0 by 1/4 inch thick flat bar on top of the battery and use a thumbnut/wingnut with flat washer to tighten against battery.
Done. it ain't going anywhere.
Barely enough room with the multiple wires that needed to be run behind the kick panel.
The starter and other wires can be hidden pretty easily... but add in the fat BATT cable and it gets tight.
I didn't add a ground cable directly to the tranny because it's bolted to the engine... I just have a bunch of 3\4" wide braided ground cables going from the body to the frame, the frame to the engine, and the body to the engine on both sides. I also tied the front subframe to the rear frame rails with ground cables. I have frame connectors but everything is painted, and they're not welded in.
The NEG battery cable goes through the trunk floor and bolts to the frame rail.
I ran my wire as Everett (aka Jake) described, to a bulkhead connector under the heater box. I used 1/0 welding cable for both the pos and the ground. The cable tucks under the kick - I did not have to remove it.
From the firewall side of the BHC is a short run to the Starter. My charge wire connects here also, as well as a relay for the starter.
I used the car body for the ground path. Welded a nut to the subframe and a short 1/0 cable to the engine block. I have welded-in subframe connectors.
Regarding the ground, this from Mad Electrical -
"The battery ground (NEG) is connected to the car body at the rear. And up front, another short length 1/0 cable connects from body to the engine. This system uses the car body for the long intermediate length of the NEG side of the system all the way to the engine. (It’s actually more efficient than routing a heavy gauge cable all the way forward to the engine.) And this system insures that the car body is well grounded–which is very important. Lights, fans, gauges, and many electrical system parts are connected to ground at the body metal. The accessory systems work very well with this system."
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