Trailer plug question - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 11 (permalink) Old 10-14-2011, 03:53 AM Thread Starter
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Trailer plug question

I have a winch on my trailer connected to a deep cycle battery. I tapped into the 12v power coming out of the trailer plug, the 30A circuit (trailer feed) to charge the battery.

Need to know if this circuit is constant on or turns on/off with the key.

Yea, I know I could've tested it but it started to rain.

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post #2 of 11 (permalink) Old 10-14-2011, 04:46 AM
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Re: Trailer plug question

It is on/off with the key

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post #3 of 11 (permalink) Old 10-14-2011, 02:23 PM
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Re: Trailer plug question

AND you want a circuit braker in there . If not when the batter gets down and its starts to pull form the truck you will SMOKE the 14ga wire in the truck.
I but a 30amp one in and it works fine

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post #4 of 11 (permalink) Old 10-14-2011, 05:04 PM
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Re: Trailer plug question

^^^^ But the OP's intent is to charge the deep cycle. And yeah, that was my first thought; that little wire is no good for pushing a charge.

Does anyone make a 12VDC -> 12VDC trickle charger? Something that would limit the charge current to the battery being charged, so that would limit the current load from the supply? That would do the trick.
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post #5 of 11 (permalink) Old 10-15-2011, 02:54 AM
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Re: Trailer plug question

Quote:
Originally Posted by madpogue View Post
^^^^ But the OP's intent is to charge the deep cycle. And yeah, that was my first thought; that little wire is no good for pushing a charge.

Does anyone make a 12VDC -> 12VDC trickle charger? Something that would limit the charge current to the battery being charged, so that would limit the current load from the supply? That would do the trick.
Yeah. That is what mine does on the trailer, charge the battery. But unless you unplug the trailer EVERY time you use the winch, you run the risk of meting that wire with out a circuit braker. I am still looking to get a solar panle charger for my trailer, since i dont use it alot

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post #6 of 11 (permalink) Old 10-15-2011, 03:08 AM
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Re: Trailer plug question

If you put a 30 amp breaker or fuse in the system on a 14 gage wire you are going to end up melting it anyway if you have a short or a long surge on that line. Most 14 gage wires are only rated at 15 amps depending on the insulation.

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post #7 of 11 (permalink) Old 10-15-2011, 03:12 AM
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Re: Trailer plug question

My chart shows 32 amps
http://www.powerstream.com/Wire_Size.htm

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post #8 of 11 (permalink) Old 10-15-2011, 04:23 AM
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Re: Trailer plug question

If you read the paragraph under "Load Carrying Capacities" you will see that there are several variables that need to be taken into consideration for that amperage. A couple of them are the length of run and type of insulation that is use to cover the wire, neither of which they tell you.

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post #9 of 11 (permalink) Old 10-15-2011, 12:39 PM
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Re: Trailer plug question

So where is your chart for amp ratings

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post #10 of 11 (permalink) Old 10-15-2011, 04:44 PM
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Re: Trailer plug question

Ah, I get it; when you use the winch with the trailer connected, it tries to get its power directly from the truck rather than the on-board battery, right? What if you just put an inline switch on that wire, flip it off to operate the winch off the on-board battery, flip it on to charge?
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