School bus. Need help

[Jameslinx]

I know this is a little outside the realm of what most of you guys deal with. Deft is for me. I'm a bus mechanic in jersey, I've got a school bus that the radio just quit on the driver yesterday, j swapped the Hu out and no I'm having an issue with my speakers. I can hook my speakers up, they work, but when I turn off the bus, kill power the hu, and turn it back on, they don't work, if I disconnect the wires and re connect they work fine. Am I looking at a ground issue?

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