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Message: [QUOTE="birdco85, post: 590876, member: 6070"] Quick back story, truck is overall in good condition. About 6-8 months ago I went on a camping trip with my camper. Came home and flipped the switch to activate my electric corner jacks, did my thing, and forgot to turn the switch off. The switch activates a control box (relays), so I left the relays activated for about 2 weeks. The whole time the camper was still connected to the truck. Went out to the camper and noticed that the switch was still on, turned it off, and realized that the two truck batteries and the camper battery were dead. I have the camper wired to the truck the truck batteries without a solenoid due to having a 60 watt solar panel on the roof of the camper. So in theory, the solar panel will recharge all 3 batteries. Well it couldn't keep up apparently and the batteries were more dead than Hostess. Jumped the truck and thought all was good. Well about another few weeks pass (I don't drive the truck much) and the batteries were dead again. Jumped again and drove it a good while to charge them. All was good for the next couple weeks probably because I drove it every couple days. About a month ago, I replaced the batteries ( I love Costco) after doing my injectors and efuel and all the fun stuff. Went out today, and they are so dead I'm getting about 4 volts and the battery. So I did the usual, disconnected the batteries, connected my multimeter in line, and did an amp check. Im pulling about .05-.06 amps. I pulled every fuse one by one and the only thing that made it change was the dome and stereo fuse. I have a had a small Harbor Freight charger connected to it for the last couple weeks to maintain them. I did go out to the truck yesterday, didn't start it, but fixed the explorer overhead console, and my keyless entry worked fine. The voltmeter did look a little bit lower than normal when I turned the key on to check the OHC. So, in the research I've done, it looks like there a couple things that can do it, such as the battery cables and alternator. Does anyone have any experience with this? My positive cable on the passenger side does have a small bit of corrosion on it (not much at all) and I do not get the battery light. Is there any other things that I should check, voltages of amps? Thanks guys, this is definitely stumping me. [/QUOTE]