OK so check the WFCO is getting in 120vac and putting out 13.6vdc
But it is mostly pointless if you are using a generator. WFCO is notorious for not entering boost mode (14.4v) when expected and instead will just trickle charge your battery in normal mode of 13.6 volts. (12+ hours to charge) Replace the WFCO with Progressive Dynamics, IOTA or Boondocker. (4 hour charge)
Of course if the voltage is not getting to your battery you have an open circuit. In this case keep poking at all connections and components in the loop until you find the spot where voltage cuts off. Repair, replace, adjust, clean or tighten this issue until voltage is same from battery to the load/fuse center.
