Post the model number of the power distribution panel where the circuit breaker and 12VDC fuses are located.
It is probably a WFCO 8900 series.
The converter/charger module would be in the bottom compartment of that unit.
This photo shows the 120VAC circuit breakers missing on the left hand side of the power distribution box
Being a 1996 model it probably does not a good smart mode converter/charger unit installed. You might want to consider this upgrade which will take better care of your batteries.
Let us know what the model number is of your converter/charger unit.