WFCO Converter

Randy at Best Converters has several slide in replacements for the WFCO. Easy to swap out and he will guide you thru it if you need help. clicky

It seems that it goes either into smart mode or boost mode only. Full charge when the lights are on or nothing

You will want to get a smart mode converter/charger unit...

ALot of folks have problems with the WFCO products ever going into smart mode charging... I would replace your WFCO unit with a Progressive Dynamics or IOTA unit that will always work in smart mode when required...

If the charger never goes into smart mode charging it will remain at 13.6VDC and is known to boil out your battery fluids resulting in battery failure unless you do a very regular Battery maintenance inspection routine...

Read up on the WFCO products not going into smart mode sequences...

Roy Ken

35 or 45 or 55 or 60 amps is fine. DO NOT spend money on a WFCO.
Get a Progressive Dynamics or IOTA replacement. Especially if using a generator to recharge.
Boondocker is fine for plugged into utility power.

I checked and cleaned all the connections

Make sure all the connections are good but that is the absolute classic symptom of a converter going bad.