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.