No power to anything

I don't know but... During a beer drinking BS session, A fellow tech was telling me a bout some Chrysler product ( hd diesel truck if my memory serves ) that has a big link hidden underneath the main relay box. Pulled relays and found no power fed into any of them, much like a bad positive cable. He didn't say if it had corroded in two or burned open, just complained about hardly enough wire length to invert that box.

This '01 gas I'm trying to fix up has a MUCH bigger relay box than the old 97. RIGHT BY THE BATTERY it has some acid damage, and not much slack. I'll probably have it out of there before long