Good Sam Club Open Roads Forum: Dinghy Towing: Charging a towed vehicle's battery
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 > Charging a towed vehicle's battery

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dodge guy

Bartlett IL

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Joined: 03/23/2004

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Posted: 09/26/21 05:54am Link  |  Quote  |  Print  |  Notify Moderator

The MH should have a pin that’s 12V hot when the engine is running. I use a 6-way at the toad (standard for RV use). However some cars require the battery to be disconnected to tow. With that you could get a small lawnmower type battery and wire it in as a dedicated battery for he brake controller and run the charge wire to that and run a 12V outlet for the brake system.


Wife Kim
Son Brandon 17yrs
Daughter Marissa 16yrs
Dog Bailey

12 Forest River Georgetown 350TS Hellwig sway bars, BlueOx TrueCenter stabilizer

13 Ford Explorer Roadmaster Stowmaster 5000, VIP Tow>
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willald

NC

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Posted: 09/28/21 01:42pm Link  |  Quote  |  Print  |  Notify Moderator

It is true that the MH will have an 'always hot' pin in the back, usually part of the 7 pin connector back there.

HOWEVER, as someone previously stated, do NOT assume that said pin is indeed hot. Check it with your voltmeter!

On Ford's F53 chassis, they do NOT wire that pin to 12V power from the factory. Neither do most RV manufacturers. We learned this with our Newmar we just bought a few months ago.

On ours, Newmar *did* run the wire from up under the dashboard, right out to the 7 pin connector at the back; They just didn't connect it at either end. I had to do that, before the charge wire would work.

Sooo, whether you use a simple charge wire or some kind of charger...Don't assume the wire thats supposed to be always hot, is. Check it with the voltmeter first.


Will and Cheryl
2021 Newmar Baystar 3014 on F53 (7.3 V8) Chassis ("Brook")
2018 Jeep Wrangler JK ("Wilbur")

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