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Old 10-25-2012, 06:43 PM   #1
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Join Date: Sep 2010
Posts: 117
6 volt charging

34 RLS, 2008
I have two 6 volt batteries that I hook up for 12 volts.
I pull these from the RV to put in the utility room (warmer but not hot). It is down to 20 below at times outside here.
I want to put them on a Battery Tender, but when I hook up exactly like it was in the rig, the tender flashes "wrong hook up".
I have a positive lead from the tender hooked to positive, on one battery (batt 1), the negative lead hooked to the negative pole on the other battery Batt 2), and a lead going from the negative on batt 1 to the positive on batt 2.
I wrote to Interstate, and they sent me a chart exactly like I described above. I have a 6 volt charger too, but that means hooking them up one at a time, and that is just a hassle.
They are 90% charged right now.

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Old 10-26-2012, 07:21 AM   #2
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Join Date: Oct 2009
Location: South Eastern PA
Posts: 19,830
As long as your charger is hooked up like you describe your 12 volt battery tender should work. A "wrong hookup" error means one is backwards.
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6 volt, battery

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