We just returned from 2 weeks in the Pacific Northwest where it was cloudy, rained a bit and campsites are often under trees. 200W of solar did what it could, but we needed the truck to do its part to keep the batteries happy - it didn't. The original separator seems to have gone wonky since we only got about 1 amp to flow to the batteries when the truck is running. (I have a current meter on the wire from the truck attached to a display mounted on the front window of the camper to monitor charging) The 1 amp was extremely constant regardless of camper battery voltage. Go figure.
Solution seems to be to toss out the old and replace it with... what? After research, I've narrowed my choices to two:
1) Renogy 40A DC to DC Battery Charger
2) Blue Seas 7611 Battery Link ACR
Cost difference not an issue
FWC wiring and connectors from my 2010 GMC 2500 to my 2013 Hawk
Already have a solar controller that does a decent job of managing my AGM batteries
Not keen to run wires from camper to truck
REALLY tired of dealing with electrical issues with my camper. Want a mostly forget about it solution.