1994 SMB Ford Draining Battery
It sounds like your house battery is probably shot. Do you have any idea when/if that was ever replaced? They’re usually good for 3-5 yrs if properly maintained, when dead and connected to a system, they can sometimes draw down any other batteries as well as create some unexplainable symptoms even with a separator or isolator, as there’s the possibility of not having enough current for them to properly function, or they’re just shot. Those original isolators tend to go as well, even though you said you tested, it may be stuck open, or closed if you’re not getting a charge.
In my case, after I purchased our rig, I’d find the starting battery dead after only 2 days of sitting, it was being drawn down by the house battery which was shot along with the original isolator, both needed to be replaced, I now have a separator and a solar system to keep the battery bank charged, not only when idle, but when we’re camped to keep things topped.
When you do get things sorted, if you don’t already, suggest you add a solar panel and charger.
'03 Ford E350 7.3L Diesel
SMB RB50 w/CCV top
Quigley 4X4 w/Deavers & Agile RIP kit
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'03 Ford E350 7.3L Diesel
(de)SMB'd Custom RB-50
Quigley 4X4 w/Deavers & Agile Offroad's R.I.P. package
CCV High Profile Pop Top
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