Re: 69 with battery in trunk, one wire alternator, MSD, nothing else w
Ryan, feeding from the battery INTO any of the ports on the fuse block (IGN, BATT, ACC) is NOT how to feed the fuse box.
There is a red 12 gauge wire that goes into the firewall bulkhead connector under the brake booster. It's the main positive feed to the fuse box. This wire should go to the positive of your trunk mounted battery with a fuse at the battery to protect the run. A 25 amp fuse should suffice.
As you've moved the battery to the trunk, make sure you ground it's negative to the engine block. OR you can ground it to the rear chassis then add a same sized cable between the front chassis to the engine block.
You also need to ground the body to the battery negative.
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1971 Monte Carlo SS454-496ci 600hp
1999 Trans Am-500hp
2003 Iszu Ascender XL Limited V8