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It looks to be a real cheap-o charge controller. Use at your own risk.
Here you go: https://directvoltage-e7b.kxcdn.com/wp-content/uploads/2017/04/Manual_PDF.pdf
Amazing what a simple web-search can do.
What brand and model?
Is that the one at Fort Davis? Was there back in the 80s.
Seems like most newer models have them.
I say solar. With a good 100 + watt system you're covered at home and on the road.
Get a site while you can.
It's the best of the west!
May need new tires! [LOL]
So what is NOT working? Sound like you're saying some 12v systems are working while others are not. I.E "He say the refrig is getting 12 volts".
Island Lake CG on the Beartooth Highway.
Go West Young Man! The Dakotas, Montana, Wyoming, Idaho, Colorado.
I used a Sharpie and put a "C" on all the tools I keep in the camper. Even every individual socket in the set.
I have two of those Harbor Freight ammo boxes that I use for all my setup gear. Duplicate equipment in each and one stays in the camper, one stays...