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Old 04-05-2017, 07:28 PM #1
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7pin 12v power hookup

Didn't find this information anywhere... I would like if any of you ever tried to calculate the max amp output on the 12v power hookup on the 7pin connector?

I'm trying to figure how long it would take to charge my trailer bettery.
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Old 04-05-2017, 08:28 PM #2
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I could not find anything in my 2013 owners manual. I'm sure there is a fuse or breaker to protect that line, but it won't limit the power until the max is exceeded. I don't think you can determine a charge time due to the capacity and state of charge of the trailer battery. It will supply full alternator voltage as it does for the T4 battery.

I found this diagram on line:
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Old 04-07-2017, 09:26 AM #3
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Quote:
Originally Posted by BobsTrail View Post
I could not find anything in my 2013 owners manual. I'm sure there is a fuse or breaker to protect that line, but it won't limit the power until the max is exceeded. I don't think you can determine a charge time due to the capacity and state of charge of the trailer battery. It will supply full alternator voltage as it does for the T4 battery.

I found this diagram on line:
Yeah full alternator amp, but given the awg of the pin cable I guess it shouldn't give more than max 10-12amp?

I'm trying to figure if the power will be enough to recharge my travel trailer battery after a night with the 12v fridge, some led and running the heater fan... I'll be driving 5-6h a day.
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Old 04-07-2017, 10:00 AM #4
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Old 04-08-2017, 12:08 PM #5
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After a little research, I came to the conclusion that the 12v from the 7pin connection will not be sufficient for charging the trailer battery.

The 12v lead is only 10awg and was designed to trickle charge the trailer battery and won't do much to recharge a ~11v

This left me with 2 option:

1) Fishing 2x 2awg from the truck battery to the rear of the truck and finish it with a Anderson plug.



Now I will have full alternator amp. Upside is (one day) I can also use it to power a rear winch 7pin 12v power hookup


2) This is the most common (boring) option chosen by most camper: buying a small genset to recharge the trailer battery.

Upside is no need for elaborated install. Just plug and charge.

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Old 04-08-2017, 01:11 PM #6
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#10 wire will carry up to 30 amps, surprised it would be too small.

If you run a separate wire, I think I would use a battery isolator like is used when there are 2 batteries under the hood. Then the trailer can not discharge the T4 battery and it may give some protection if there is a problem in the trailer wiring.
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Old 07-04-2021, 04:28 PM #7
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No power at truck trailer connection at battery pin.

I'd be happy just to get some power at my trailer hookup point. The battery terminal point on the truck reads about 0.25 volts when matched against the ground terminal point. The three trailer fuses under the hood look good but I think the power only goes to that Battery terminal in the connector through a relay. Is that correct? The fuses are marked Tail lights, Brake and Backup I believe.
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