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2014 RRS
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I know the front cig lighter loses power after a few minutes of shutdown so it wouldn't work for a tender. You'll have to check the rear. I pop the hood and use the charging posts.
 

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Most technical folks advise NOT to reverse charge through a cigar lighter. On some models solar chargers and other types or reverse chargers will keep your systems awake and result in a battery drain higher than the charger can compensate for.

My advise, purchase a REAL battery tender that is fully automatic and install it on your jump posts under the hood, mount the box unit to an empty spot behind the grill or on the inner fender route the pug in to somewhere discrete and easy to reach.
 
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