When I redid the isolator several years ago I put in a Trik-L-Start to keep the engine batteries charged while parked and plugged in. I suspect that it has died. What's the current thinking for a similar device?
I used a Trik L Start for six years with no issues. I'm now using an AmpL Start, more lithium friendly. PM me, I'll send you my old one for postage.
I installed a Progressive dynamics PD 9260 solely for my chassis battery.
I replaced my trickle start with the AGM version 2 years ago. Seems to be working great.
I made my own as the kind I had on my Monaco would work only after the house
batteries were up and it burnt out and it only charged the chassis battery after the
house batteries were up and I think the chassis battery is the most important one
to be up.
This is one of my next mods... cheap and easy install