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New to Forum.
I purchased a 2001 E350 XL van with 7.3 diesel. This van was used for Handicap service in Texas then ended up at a dealer in CA, where I bought it.
The van has performed well since purchase (12-20), I purchased shop repair manuals and notice that a switch was installed to run the back heater. Don't know why, since there was a switch already on the dash. Anyway, I just found it and used it to run the back fan for heating the van and shut it down yesterday and today I found the batteries (dual) dead. So, I'll have to verify this, but I suspect they used an live wire that doesn't shut off when the ignition is turned off, which has drained both batteries.
I checked the manuals and didn't see any warnings about charging the batteries in while in the vehicle.
But I tossing this here to see if any of you know that it wouldn't be a good ideal, to charge up the system while in the vehicle.
Thanks for the time and info.