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My last truck was a 2001 F350 DRW. The 12vdc feed from the truck to the 5th wheel was only hot with the key on.
So, when parked, turning off the key eliminated any drain issues.
IF your truck is not wired this way, a relay is a easy fix. I would advise against using a Isolator because of the voltage drop across it. A combiner/relay would be the correct product to use if your tow vehicle feed is hot all the time.
Jim
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2012 Ram Laramie 3500 DRW 4x4 3.73 Tow Max Pkg B&W Companion 60 gal RDS aux fuel tank. 2014 Montana 3150RL, 2 A/C's, Leather, 6 Point Jacks, Splendede WD2100XC, Mor/ryde X-Factor, Duravis 250 tires with TST 507RV monitors. 2 x Honda EU2000's
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