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Open Roads Forum  >  Tech Issues

 > Charging Camper/Coach Battery with Running Lights Lead from Flat-4

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Mark_Naturist_Camper

Land O' Lakes, Florida

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Posted: 02/09/20 09:01pm Link  |  Quote  |  Print  |  Notify Moderator

I am installing a brake controller on my trailer. Among other things this thing allows me to connect my camper with trailer brakes to a Flat-4 Hookup. The link is below. My question is the way the thing gets power with the flat-4 is the running lights power. If I simply Jumper the 12VDC line from the Running lights line in my 7-way (Camper) to 4-flat adapter (Car) adapter will it work Okay and also charge the coach batteries. Or will it blow up? (Melt wires/blow fuses)

I'm looking for anyone that has tried to charge coach batteries, or simply powered a refrigerator, from a flat-4 running lights lead, (running lights must be turned on).

Thank you for any help.


AUTOWBRAKE

ScottG

Bothell Wa.

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Posted: 02/09/20 09:08pm Link  |  Quote  |  Print  |  Notify Moderator

No, the flat 4 cannot carry that kind of load.


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time2roll

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Posted: 02/09/20 09:44pm Link  |  Quote  |  Print  |  Notify Moderator

I replaced the flat-4 with a 7-pin.
Any decent trailer, RV or hitch shop can do the swap.

etrailer probably has what you need:
https://www.etrailer.com/dept-pg-Wiring-sf-Trailer_Connectors.aspx


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jdc1

Riverside, Ca

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Posted: 02/09/20 11:26pm Link  |  Quote  |  Print  |  Notify Moderator

ScottG wrote:

No, the flat 4 cannot carry that kind of load.


Wires are wayyyyy undersized to help you.

dougrainer

Carrolton, Texas

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Posted: 02/10/20 05:47am Link  |  Quote  |  Print  |  Notify Moderator

Very clever idea
1. IF your Trailer battery is bad or dead or below 11 volts, you will NOT have Trailer Brakes at all
2. 4 Way flat gauge wiring cannot supply the needed power, especially if you attempt to tie into the Running light circuit. AND, I would worry about the Tow vehicles gauge wiring and fuse set up in its running circuit.
3. This system needs to be installed with a standard 7 way Bargman Trailer plug, that has the required Charge line run to the trailer. If no charge line to the trailer from the tow vehicle, the Brake system will slowly deplete the Trailer battery every time the brake system engages.
4. IF you have a 4 way flat on your truck(tow vehicle) AND your trailer, something is wrong unless the trailer is a utility trailer. RV camping trailers always have a 7 way Bargman plug on the trailer.

Roger10378

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Posted: 02/10/20 09:33am Link  |  Quote  |  Print  |  Notify Moderator

Watch the review by e-trailer. They don't recommend using on the 4 wire because the wiring is not heavy enough.


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Lwiddis

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Posted: 02/10/20 11:15am Link  |  Quote  |  Print  |  Notify Moderator

Solar is a very natural recharging method, Naturist.


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bikendan

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Posted: 02/10/20 11:38am Link  |  Quote  |  Print  |  Notify Moderator

Sounds like someone should've bought a vehicle with a real factory tow package.


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BILDER

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Posted: 02/10/20 11:59am Link  |  Quote  |  Print  |  Notify Moderator

Go to the web site 5 wires needed,

Lwiddis

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Posted: 02/10/20 06:00pm Link  |  Quote  |  Print  |  Notify Moderator

There goes bikendan again. Blunt..accurate.

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