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Old 12-19-2015, 02:34 PM   #15
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I bought a digital volt meter from Amazon that plugs into the 12v recepticle (cigarette lighter). I can instantly check my voltage. It I switch it to store with shoe pwr. It goes blank. Quick & simple.

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Old 12-19-2015, 02:37 PM   #16
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Thank you Drathaar. Battery Tender it is.

Brad Waite
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Old 12-19-2015, 02:52 PM   #17
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Just so people know, the cheapo battery tender from Harbor Freight will over charge your battery in storage. I tried 2 of them and both were not shutting off. As far as the lack of charge on shore power, I'd suspect the contacts in the relay. It usually helps to toggel or flip the switch of electrical things when troubleshooting, as well as giving it a few good "thumps" to see if there are some questionable connections moving around. A bad connection will run hot so that can be a clue. I like to start any troubleshooting with a factory wiring diagram if you can get one or often I draw my own as I go to help me understand exactly how the current flows. Use caution not to short anything when poking around as there is a lot of current available in a battery. This should be a simple fix. Leland
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Old 12-19-2015, 08:43 PM   #18
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Long Beach , California
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Yes, on everything suggested so far. I find that if the battery drains completely, the relay tends not to function. It needs some type of voltage source to the battery enough to engage the relay circuit. If the battery charges with the tow vehicle connected, then you shouldn't have a problem after, because the relay should get energized then.

Also, check the relay, there are fuses on each contact lead.

However, if your battery is not holding a charge that will be another issue.
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Old 12-20-2015, 12:24 AM   #19
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Yup. The control relay that connects the battery won't work unless there is enough charge on the battery. That's why my solar system is hard wired to always charge the batteries.

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