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Charging a battery in p/u truck bed - Printable Version

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Charging a battery in p/u truck bed - johnnyliberty1776 - 05-23-2020

I have a 2014 F-150 P/U with camper shell. I plan to camp out of it. Would like to know how I can trickle charge a deep cycle battery I plan to place in the bed of the truck. Can I do so from the trailer connection 7 point and or 4 point electric connectors for a trailer tow?

Thanks to Mr. Bob Wells and all you folks for the great info!


RE: Charging a battery in p/u truck bed - slow2day - 05-23-2020

A 7-pin I believe has a hot wire but the 4-pin does not.

If the battery is depleted much at all, it could require quite a flow of amps to recharge.

So you would probably pop fuses in the tow connector circuit.

Here's some more info from etrailer.com:

https://www.etrailer.com/question-30687.html


RE: Charging a battery in p/u truck bed - johnnyliberty1776 - 05-23-2020

I will be mounting a Renogy 100 w solar panel on the roof. Just thinking about cloudy days as I want to run a small frig. So, if I am driving down the road a trickle charge is going into the battery.

On the 7 pin, the pin in the 1 o'clock position is the line for the battery and the pin in the 7 o'clock position is ground. Just not sure if I connect a wire to each and run to the battery if it will work.

I'll check out the video and thank you.


RE: Charging a battery in p/u truck bed - B and C - 05-23-2020

You would be much better served installing a continuous duty solenoid to charge the aux battery. Connect one side to the alternator and the other to your aux battery (fuse required).


RE: Charging a battery in p/u truck bed - johnnyliberty1776 - 05-23-2020

What do you think he means by, " you could maintain the power to the battery but not charge it."

Very helpful article. thanks for it.


RE: Charging a battery in p/u truck bed - slow2day - 05-23-2020

Starting with a fully charged battery (by charger and/or solar), maintaining would only require a few amps. A trickle.

But using the battery overnight to power a fridge or whatever, it will be depleted and it would require a lot more amps to charge it back up.

More amps than what the trailer connector can provide. The size of the wiring and fuse is too small for a lot of amps to flow to the auxiliary battery.

Look at the size of the wire from the alternator to your truck's starting battery. It's large so a lot of juice can flow.

The wiring for the trailer connector (and fuse) is a lot smaller and can only handle a much smaller current flow.


RE: Charging a battery in p/u truck bed - B and C - 05-23-2020

Small wire, long distance = voltage drop. Here is a voltage drop calculator based on length and gauge of wire: https://www.solar-electric.com/learning-center/wire-loss-tables.html/


RE: Charging a battery in p/u truck bed - johnnyliberty1776 - 05-23-2020

Continuous duty solenoid...I'll need to educate myself on that as it sounds good. Does it meter electric to the battery much like a solar charge controller?


RE: Charging a battery in p/u truck bed - slow2day - 05-23-2020

It connects your alternator to the aux. battery so it is charged as you drive.


RE: Charging a battery in p/u truck bed - B and C - 05-23-2020

Usually connected with 4 gauge cable for high currents.