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Old 01-05-2013, 01:50 AM   #1
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Battery not charging when in tow

I've got a 2011 19bh jay flight. My inverter was completely shot and was replaced under warranty at the dealer, which is 100 miles away. When I got home, I noticed my battery was almost dead and the lights on the status panel only showed 1/4 lit up when plugged into the truck. When plugged into shoreline power, all 4 lights light up and charges the battery. Any suggestions? If I remember correctly, all 4 lights should come for battery power when plugged into the truck as well, correct?
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Old 01-05-2013, 05:49 AM   #2
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If you are using a 2009 and UP F series FORD truck the TRAILER TOW DC VOLTAGE is controlled by a FUSE and a BLACK PLUG-IN RELAY in the truck fuse panel.

Look in the FORD TRUCK MANUAL for these two positions in the fuse panel.

My new 2010 F150 Truck had these two items in an unmarked envelope in the truck glove box. Apparently this only allows the TRAILER TOW DC VOLTAGE to be "ON" when the truck ignition key is turned on.

I don't know about the other brand trucks.

You mention INVERTER above - I assume you mean CONVERTER/CHARGER. This should not have anything to do with your truck not sending 12VDC to trailer when the truck ignition key is turned on.

You should read the 12VDC from BLADE 1 (GND) and BLADE 4(12VDC) at the truck 7-way receptacle whne the ignition key is turned on.


On your trailer side the 7-way TRAILER PLUG BLADE 4 should be directly connected to your trailer battery POSITIVE 12VDC terminal. There may an in-line fuse there as well.

sample photos from google images.

The wire colors shown on these two photos sometimes differ from the different manufacturers.

I would look around where the Converter/Charger unit ground connections were made - the warrenty replacement may have left some wires off near the battery terminals...

I assume all of this worked before TRAILER TOW 12VDC wise before the converter/charger was repaired.

BTW Most of us usually has an entry on what we are using Truck and Trailer wise either listed with the post or at least in our profile. Lets everyone know what equipment we have.

Roy Ken
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2008 STARCRAFT 14RT OFF-ROAD POPUP with PD9260C and three 85AH 12VDC batteries
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Old 01-05-2013, 10:01 AM   #3
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On my 06 Chevy the battery prong on the truck receptacle did not come from the factory hot. If you have a test light check to see if the battery prong in the receptacle is hot. My truck came from the factory with a dummy fuse for that curcuit in the fuse box under the hood so it was just as simple as putting a fuse in to complete curcuit.
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Old 01-05-2013, 11:34 AM   #4
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My tow vehicle is an '08 dodge 3500 cummins. All the lights and everything appear to work just fine when plugged into the truck. I've already checked all the fuses, including the 30 amp fuse near the battery. All are intact. I'll mess with the plugs today and see what I can find. Thanks for your help.
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Old 01-05-2013, 12:16 PM   #5
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I just went out with the multimeter. The battery reads 12.6 volts with nothing connected. When connected to shoreline power, it increases to 13.8 volts. When connected to the truck, the battery voltage doesn't change and stays at about 12.6. I also checked the plug on the truck and can only get anywhere between 2.3-3.5 volts and it fluctuates a lot. I that a normal output?
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Old 01-05-2013, 12:48 PM   #6
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Did you turn your Dodge truck ignition key "on"

Put multimeter leads on blade 1 and blade 4 on the truck side. My receptacle has a small wiring diagram imprint on it on it. Looking for GND and 12VDC BAT

Did all of this work OK before you took the trailer back for warrenty work?

Roy ken
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Roy and Carolyn
I claim Horse Creek Country in Southern Ill - Momabear is from North Texas
We live in King George VA
RETIRED DOD DOAF DON CONTRACTOR Electronics Tech 42YRS

"We're burning daylight" - John Wayne
2008 STARCRAFT 14RT OFF-ROAD POPUP with PD9260C and three 85AH 12VDC batteries
2010 F150 FX4 5.4 GAS with 3.73 gears - Super Cab - Towing Package - 2KW Honda EU2000i Gen
K9PHT (since 1957) 146.52Mhz
"We always have a PLAN B"
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Old 01-05-2013, 12:53 PM   #7
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Try this as well... With the trailer PLUG held in your hands connect the multimeter to the blade 1 and blade 4 and see if you read the 12.6VDC there.

If you can read your trailer battery there then the trbl is on the truck side. Fuse? Ignition OFF? bad ground between truck and trailer etc... Seems like i remember the DODGE trailer blades being always hot - may be wrong there...

Roy Ken
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Roy and Carolyn
I claim Horse Creek Country in Southern Ill - Momabear is from North Texas
We live in King George VA
RETIRED DOD DOAF DON CONTRACTOR Electronics Tech 42YRS

"We're burning daylight" - John Wayne
2008 STARCRAFT 14RT OFF-ROAD POPUP with PD9260C and three 85AH 12VDC batteries
2010 F150 FX4 5.4 GAS with 3.73 gears - Super Cab - Towing Package - 2KW Honda EU2000i Gen
K9PHT (since 1957) 146.52Mhz
"We always have a PLAN B"
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Old 01-05-2013, 03:10 PM   #8
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Once you confirm you have aux power to the female end of the 7 pin connector I would wonder if you have a loose wire nut. Where the 7 pin wire harness enters the TT there is a wire nut with two wires (3 wires total) connected to the red battery wire (Aux power from the TV). If this wire nut is loose or a wire was never fully engaged when it was tightened down it might have vibrated loose and you are not getting power from the TV to the battery.

Otherwise I would confirm that the battery has not gone bad. Two options; if you have a charger at home plug the TT battery in and let it take a full charge. If it does take a charge and hold the charge the battery most likely is good. Otherwise pull the battery and bring it into an auto parts/repair shop and have it tested.

When plugged into the shore power the indicator lights ALWAYS show four lights and charged. You need to unplug the shore power and then test the battery after a few hours to see if the battery took a charge.
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Old 01-05-2013, 07:06 PM   #9
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Yes, I tried all of this with the key off/on/ engine running, with no change. If I disconnect the shoreline power, the battery reads like 12.6, and 12.6 when it's fully disconnected. I tried the multimeter on the ground prong and 12v prong it's still reading around 3 volts. When I pt a draw on the battery, my monitor LEDs with slowly drop 4-3-2-1 as the charge drops. I'll pull that cover off tomorrow where the cord connects to the TT and see if anything is wrong there, and look for some fuses in the truck. Thanks for the help so far, at least I feel like I can make some progress by knowing what to look for.
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Old 01-05-2013, 07:18 PM   #10
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I just went out and plugged the multimeter into the cord on the TT. Wen I plug into the respective power and ground terminals, I get 13.51v when plugged into shoreline, and reads 12.4v with no external power attached. I guess it's the truck that's not working.
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