Trunk mount battery - Definitive thread on safety/legality

[Jim Nilsen]

i used a painless master switch, and used it to cut the battery ground,,,, killed car instantly.
I simply had my 8ga alt wire ran to solenoid on fierwall,made my own starter jumper and ran a 2/0 from solenoid to starter I had double insulated 2/0 from hatch mounted battery to solenoid and also used piece of heater hose and some split loom and a hole grommet for battery positive cable through firewall to solenoid.
if you cut all grounds (except memory items) car will die.
My ground was 2/0 from batt neg to switch , then switch to clean chassis ground. also added several ground from block to chassis(unibody as it was a 77 Monza) if you interrupt positive,the alt can still make circuit to ign,killing negative and no complete circuit.

Some tech rules do not allow the ground to be used to break the circuit because in an accident torn wiring can make the ground in their eyes. I have never believed it would ever make a sufficient ground but I didn't write the rules and MAD enterprises has fought with the NHRA over it a long time ago. It really does work and is a lot easier to wire that way but the reason for the fancy solenoid from MAD was to make it all work according to the rules.

The Flaming River switch if installed in the rear of the car might actually kill everything in a rear impact as it is a push button and not a rotating switch.