Re: How to mount battery in trunk?
If you use a standard plate battery, turn the battery 90* from CarlC's picture.
I used 3/8 threaded rod, a battery tray, a box, and 1/8 inch thick steel plate the width of the frame rail and the length of the tray for reinforcement outside at the rail, in lieu of washers, and bolted the combo through the frame rail, including the battery.
I used 4/0 welding cable with crimped and soldered connections. Ran a 4/0 ground cable from the engine to the frame and ground cable from the roll bar pad in the trunk. A solder pot will aid in tinning the large cable. Have patience while the pot heats.
Just remember, the more strands the to the wire/cable, the more current it can carry. Yes, copper is heavy per foot, but an excellent conductor.
Once you move battery to the trunk, you need to either move the "sense" wire on your internal regulated alternator to the battery, or if running ext reg alt, adjust charging voltage measured at the battery to compensate.
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