no electric power

Hello all
I have a 79 JD410D backhoe and when using it the other day it shut down as if running out of fuel. Found to have no electrical power on anything. The battery is good and I can turn it over by jumping the starter but it will not start. Checking the power from the battery to the starter is good and then to one of the breakers but not the other. The breaker that has power into it has a ground coming out, using a meter across the breaker reads the battery voltage.

Suggestions?

Thanks