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Open Roads Forum  >  Dinghy Towing

 > Charging a towed vehicle's battery

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fwtraveler1

Texas

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Posted: 09/24/21 10:08am Link  |  Quote  |  Print  |  Notify Moderator

I can not get my RVI battery charger to work towing my 2020 Chev Equinox. Is there another/better system out there for charging a towed vehicle behind an RV?

obgraham

TriCites WA

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Posted: 09/24/21 10:41am Link  |  Quote  |  Print  |  Notify Moderator

In the receptacle on the motorhome there is an "always hot" pin. At least there was on mine. I had them run a separate wire from that pin directly to the toad battery.

Lwiddis

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Posted: 09/24/21 11:41am Link  |  Quote  |  Print  |  Notify Moderator

Excellent suggestion IMO.


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Posted: 09/24/21 12:54pm Link  |  Quote  |  Print  |  Notify Moderator

It could be defective, mis wired, inadequate wiring, no input from the MH. A voltmeter is your friend.


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jdc1

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Posted: 09/24/21 03:44pm Link  |  Quote  |  Print  |  Notify Moderator

Just toss a solar charger on the dash.

mowermech

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Posted: 09/25/21 05:51am Link  |  Quote  |  Print  |  Notify Moderator

obgraham wrote:

In the receptacle on the motorhome there is an "always hot" pin. At least there was on mine. I had them run a separate wire from that pin directly to the toad battery.


THAT is the best idea! Yes, it will require a 7-pin plug on the toad, but that is easily doable. Be sure that "always hot" pin is wired with 10 gauge wire from the power source in the motorhome all the way to the toad battery, and be sure there is a 30 amp fuse or circuit breaker installed in the line at the motorhome power source. Higher amperage may be required.


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JRscooby

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Posted: 09/25/21 07:34am Link  |  Quote  |  Print  |  Notify Moderator

Not sure "always hot" is the best idea. I think a better idea was have the charge pin controlled by the ignition switch of MH. (If it ain't running, it won't charge anyway)
And the toad end can't be mounted solid, unless you use a removable cord. A switch near toad battery to disconnect would stop a hot wire from causing trouble when not towing.

bighatnohorse

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Posted: 09/25/21 07:54am Link  |  Quote  |  Print  |  Notify Moderator

I'm currently installing an Invisibrake system and I have run a charge wire from the truck battery to the tow'd.
The hot wire is fused at both the truck and tow vehicle batteries.
The hot wire is always hot.

obgraham

TriCites WA

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Posted: 09/25/21 05:38pm Link  |  Quote  |  Print  |  Notify Moderator

JRscooby wrote:

Not sure "always hot" is the best idea. I think a better idea was have the charge pin controlled by the ignition switch of MH. (If it ain't running, it won't charge anyway)
And the toad end can't be mounted solid, unless you use a removable cord. A switch near toad battery to disconnect would stop a hot wire from causing trouble when not towing.
Indeed, I mis-wrote in my post. The "always hot" pin was wired to the ignition-controlled circuitry on the MoHo. I don't really want it charging when the rig is shut down.
The MoHo had the 7-bladed plug, and I used an adaptor to go to the more typical 7-pin plug to connect the toad.

lryrob9301

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Posted: 09/25/21 06:33pm Link  |  Quote  |  Print  |  Notify Moderator

fwtraveler1 wrote:

I can not get my RVI battery charger to work towing my 2020 Chev Equinox. Is there another/better system out there for charging a towed vehicle behind an RV?


Are you pulling the fuse for the rear windshield wiper as per instructions?

"NOTE: Towed Battery Charger Plus is compatible with all 12 volt batteries including trailers. 2019-present Chevy Equinox must pull rear windshield wiper fuse."


2013 Tiffin Phaeton 40QBH
2016 Chevrolet Equinox LTZ AWD V6


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