Did I kill my tow vehicle battery? Left Scamp plugged in over night into a 7 prong- 4 prong adapter hooked to jeep

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SquidScampi's picture
Last seen: 3 days 8 hours ago
Joined: 10/04/2021 - 12:27
Did I kill my tow vehicle battery? Left Scamp plugged in over night into a 7 prong- 4 prong adapter hooked to jeep

Hey folks,

new scamp lovers here— we are uneducated in the rv battery department. All I know is my jeep has to be jumped every time now after leaving the scamp plugged into the tow vehicle overnight. An accident that I'm seeing now is gonna cost me! Took the jeep on a few hour drive (no scamp) to see if i could get it charged up again, but no dice. It's my understanding that the four prong that came on the jeep is not the right thing to charge a deep cycle marine rv battery as came with our scamp (which had been sitting dead for a while) as we drive. With the o'reilly adapter to seven prong it works great for making the lights and turn signals work on the road, but this set up will not charge the trailer battery as we drive right? Also Inside the scamp is a fancy 45AMP converter that has ability to do whats called a three cycle charge if my research is right, but is this for shore power charging only? or does it also have somethin to do with charging while driving? 

If anyone could be so kind as to explain the basics to me and/or recommend a good new battery for the scamp I would greatly appreciate it! We want to do a good bit of dry camping, are interested in buying a new battery under 400$ for the scamp and also down the line do a solar panel when we get a little cashflow, so we'd like a battery that would be good for solar + dry camping for a couple nights with the furnace going! Any advice appreciated, many of the other answers regarding wiring have been helpful to read but more complex than i'm able to followblush 



Mr.T's picture
Last seen: 5 hours 58 min ago
Joined: 07/21/2020 - 12:22
With the Jeep flat 4 trailer

With the Jeep flat 4 trailer connector the Scamp should not drain the Jeep's battery unless there are tail or stop lights on -- That's all it should be wired too.  The Jeep won't charge the Scamp's battery with a flat-4 connector.  The converter in the pic powers up the trailer's 12V system when plugged into park power (120VAC) and charges the Scamp's battery, and if the trailer and Jeep are connected with a flat-4 it won't charge the Jeeps battery.

So the crux of the problem sounds like the Scamp drains the Jeep's battery through a flat-4 connector without any tail or stop lights on, and that should normally be impossible -- At least that's the way I see it.  I think it's time to have a qualified person take some amp measurements and see what's really going on.

On a side note, Mopar makes a factory 7-way harness for the Wrangler.  I installed it myself, but you can have a shop do it as well.

Last seen: 3 days 19 hours ago
Joined: 07/07/2016 - 07:06
Also have '17 Wrangler

So you have the 7-prong hookup, right?  We opted to adapt my 13' Scamp to a 4-prong vs. adding the 7-prong to my Jeep.  I don't have brakes and don't really need backup lights--I backed into a site once in the dark, just kept getting in and out of the Jeep to check where I was going.  We use a battery charger to charge up the Scamp battery before any trip, and I haven't had any problems.  I don't dry camp though, so that is an added dimension.  I usually keep my Scamp plugged in to shore power the night before a trip to get the fridge nice and cold for the drive.  Not sure if this info helps any, but a different perspective on the 4-prong vs 7-prong connection.  

Rhonda Riebow

ac0gv's picture
Last seen: 5 hours 25 min ago
Joined: 09/22/2016 - 13:57
Did you find the problem?

Inquiring minds want to know.