Trailer batteries not charging with tow vehicle hooked up - Dutchmen Owners
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Old 09-18-2021, 08:44 PM   #1
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Trailer batteries not charging with tow vehicle hooked up

Getting ready for road trip with my 2015 Duchmen Kodiak Express Ultra Lite 223 223rbsl.
Last minute Check Revealed the tow vehicle 2003 GMC Sierra 1500 Z71 with Towing package has 14.5dc volts to trailer, but does not Charge trailer 2 batteries.
I check all breakers, all fuses, I did not find a Breaker or fuse for Batteries
There has to be one at least for the AC charging.
The trailer 2 batteries do charge from an 120AC source (13.5v)
Do these Dutchmen trailers get charged while hooked up to a tow vehicle?
I was thinking they do so you can run the Refrigerator on DC and not gas while towing.
Thank you
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Old 09-18-2021, 10:44 PM   #2
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7 pin trailer electrical connector has a 12 volt supply.
My Kodiak cub has a 30 amp self resetting circuit breaker.
It looks like this:
https://www.ebay.com/itm/14364742141...49a365a09c6825

My Nissan Pathfinder that I use to tow with has a 40 amp self resetting circuit breaker.

A loose or corroded ground connection often causes trouble. Trace power from 7 pin back into trailer wiring.
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Old 09-19-2021, 05:03 AM   #3
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Quote:
Originally Posted by persistent View Post
7 pin trailer electrical connector has a 12 volt supply.
My Kodiak cub has a 30 amp self resetting circuit breaker.
A loose or corroded ground connection often causes trouble. Trace power from 7 pin back into trailer wiring.
The 30amp circuit breaker is good, good connection, and Cleaned it up.
Trailer charges the two Batteries great plugged into 120vAC.
Power from truck pig tail is 14.5VDC to breaker/fuse box, But is does not go to the batteries.
The trailer must not have the battery charging from the truck, only from 120vAC.
Too late To spend any more time on this, Soon as the rain stops Sunday We are Rolling out on the road trip.
I have a generator for any spot along the road, and Full hook ups at rv stops, both with 120vAC to keep the batteries charged up
Thanks For the input, Breaker 19, Breaker 19, Trucking over and out.
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Old 09-25-2021, 03:56 AM   #4
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If you have a volt meter or 12v test light you can check the trailer plug to battery connection by looking for voltage between pins 1 & 4. 1 is ground, 4 is the aux power/charge wire to the battery. 4 should be your battery voltage of the trailer.

Another truck is jump between pins 4 and 3, 4 should provide battery voltage to your running lights through pin 3 (it's best to jump this with a spare 15amp fuse).

I found on my Ford truck there is a fuse specifically providing power to the hitch cable's charging wire, pin 4. A few more fuses for trailer lights and another for brakes. Two of these are only referenced in there trailering package install instructions! I found one blown by checking every single fuse under the dash and in the engine bay. I make a habit of always connecting the trailer to tow vehicle with lights off and after shore power is disconnected.

PS most of our fridges run on 120v or propane, not many 12v or three way fridges installed until recent years. Click image for larger version

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Old 09-25-2021, 09:17 PM   #5
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The 12 volts from the truck goes through the 7pin to a junction box on trailer. From there to the converter. From the converter's charging circuit, the volts goes back to the batteries to charge them.

Check the 2 fuses on the truck. Mine are in 2 different locations. Labeled as trailer.
Check the circuit breakers on the trailer tongue.. Or somewhere close by. Should have 3 ... That seems to be the norm. 1 for the tongue jack. 1 for the 12 volts from battery to trailer and 1 back from trailer. You may have more or less.
Check the fuses in the 12 volt section of the distribution center above the converter. Check the 2 reverse polarity fuses. Should be 40amps.

My bet would be a fuse or a bad connection/wire or ground at the junction box where the 7pin cable transfers to the trailer wiring. Should be close to the tongue... Within 7 or 8 feet of the tongue.
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Old 09-25-2021, 09:31 PM   #6
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Charging trailer batteries from truck.

Connect the Truck to the trailer. Measure the voltage at the trailer batteries. Start the truck. Then measure voltage at the trailer batteries. If it is more than the batteries are charging and if not you either have a bad, fuse, breaker, wire, broken or poor connection. If what to see the actual DC Amperage charging or discharging rate than a DC Amp clamp meter is a great tool to have and use. AC only clamp meters will not show a DC current.
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Old 09-26-2021, 11:46 PM   #7
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Quote:
Originally Posted by trucking View Post
Getting ready for road trip with my 2015 Duchmen Kodiak Express Ultra Lite 223 223rbsl.
Last minute Check Revealed the tow vehicle 2003 GMC Sierra 1500 Z71 with Towing package has 14.5dc volts to trailer, but does not Charge trailer 2 batteries.
I check all breakers, all fuses, I did not find a Breaker or fuse for Batteries
There has to be one at least for the AC charging.
The trailer 2 batteries do charge from an 120AC source (13.5v)
Do these Dutchmen trailers get charged while hooked up to a tow vehicle?
I was thinking they do so you can run the Refrigerator on DC and not gas while towing.
Thank you
You have a connector/circuit breaker on the toung where the pigtail from the truck hooks to the trailer. the feed to the batteries also connects there. It's supposed to be self restting but seldom does. check it. You have the feed from the truck coming into one side and the feed from the trailer and to the battery on the other.
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