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09-19-2020, 04:50 PM
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#1
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Senior Member
Join Date: Feb 2019
Location: Indiana
Posts: 116
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Seven pin trailer connector 12vdc power
I realized that my rv trailer batteries are not charging from my tow vehicle. I looked up the wiring and found the 12vdc power terminal is at about one o'clock, and the ground is at about seven o'clock on the truck. With the truck running I do not get any power between the 12vdc terminal and ground. I'm figuring I should have power at this time. I checked my fuses and they check out as being good. I also pulled the plug from under the truck and checked those terminals, and get the same results. All the trailer lights and brake work perfectly.
Any ideas on where to go from here???
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09-19-2020, 05:09 PM
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#2
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Senior Member
Join Date: Jul 2010
Posts: 7,948
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Open up the trailer plug and see if you have any wire off the 12vdc hot. (4)
Probably the trailer wasn't wired for it.
Lights, brakes are all seperate fromthe 12 volt for charging.
Here is the 7 pin layout for a typical trailer.
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09-19-2020, 06:56 PM
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#3
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Senior Member
Join Date: Feb 2019
Location: Indiana
Posts: 116
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I used a similar chart to find which terminal was hot.....but it's not....no voltage....
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09-19-2020, 07:18 PM
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#4
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Senior Member
Join Date: Nov 2019
Posts: 1,427
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If your truck is a Ford please let us know.
Include if it's a pushbutton start, there are several hoops you must jump though get power at that 12V terminal.
__________________
 2019 F150 4X4 7050 GVWR 1903 payload
2018 Avenger 21RBS 7700 GVWR
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09-19-2020, 07:31 PM
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#5
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Site Team
Join Date: Jan 2007
Location: Goodyear, Arizona
Posts: 33,847
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Quote:
Originally Posted by Mike134
If your truck is a Ford please let us know.
Include if it's a pushbutton start, there are several hoops you must jump though get power at that 12V terminal.
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Yea, it's always helpful if posted year, make and model of truck and trailer, since you don't have any of that information in your profile.
__________________
Dan-Retired California Firefighter/EMT
Shawn-Musician/Entrepreneur/Wine Expert
and Zoe the Wonder Dog(R.I.P.) 
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package
4pt Equal-i-zer WDH and 1828lbs of payload capacity
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09-19-2020, 07:39 PM
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#6
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Junior Member
Join Date: Sep 2020
Posts: 2
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I have a new F350 - interested in hearing about this.
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2021 Silverback 29RW - 2020 F350 Powerstroke
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09-19-2020, 07:39 PM
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#7
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Senior Member
Join Date: Feb 2019
Location: Indiana
Posts: 116
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Yes...sorry...you're absolutely right. 2014 Ram 4x4 1500. I'm not sure when it quit working as we drove it to Alaska pulling a trailer a couple years ago and it worked fine then...then traded in the trailer on a motorhome and I didn't tow during that time. This year, we are towing a new trailer, but until last week always had ac power on site. This week we did some dry camping and found the batteries weren't charging betwen sites at all....
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09-19-2020, 07:59 PM
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#8
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Senior Member
Join Date: Nov 2019
Posts: 1,427
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Sorry can't offer any help for a Ram.
The Ford 12V charge line doesn't work unless you have a trailer connected, truck running, press the brake pedal for about 3 seconds and have all the doors fully closed. And if it's a push button start leave the fob inside the running truck.
__________________
2019 F150 4X4 7050 GVWR 1903 payload
2018 Avenger 21RBS 7700 GVWR
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09-19-2020, 08:04 PM
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#9
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Junior Member
Join Date: Sep 2020
Posts: 2
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Thanks Mike - appreciate the info.
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2021 Silverback 29RW - 2020 F350 Powerstroke
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09-19-2020, 08:11 PM
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#10
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Site Team
Join Date: Jan 2007
Location: Goodyear, Arizona
Posts: 33,847
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Quote:
Originally Posted by chengdave
Yes...sorry...you're absolutely right. 2014 Ram 4x4 1500. I'm not sure when it quit working as we drove it to Alaska pulling a trailer a couple years ago and it worked fine then...then traded in the trailer on a motorhome and I didn't tow during that time. This year, we are towing a new trailer, but until last week always had ac power on site. This week we did some dry camping and found the batteries weren't charging betwen sites at all....
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Your Ram, if operating correctly, will only provide a trickle charge at best while driving. So if the battery was discharged before moving to another dry camp spot, unless you drove 8-12 hours, the battery was probably never fully recharged.
You should have the battery fully recharged and then load tested or hydrometer tested.
Then deal with why your truck is not providing power through the charge wire.
__________________
Dan-Retired California Firefighter/EMT
Shawn-Musician/Entrepreneur/Wine Expert
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package
4pt Equal-i-zer WDH and 1828lbs of payload capacity
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09-19-2020, 08:44 PM
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#11
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Senior Member
Join Date: Feb 2019
Location: Indiana
Posts: 116
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Thanks..I will check with a better voltmter when I get home....
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09-20-2020, 03:39 PM
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#12
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Senior Member
Join Date: Jun 2020
Location: On Long Island NY
Posts: 246
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For Chevy Owners:
FYI for Chevy owners: Some of the Chevys, even the ones with towing packages do not come with pin 4 connected (12V Aux). You need to go under the hood and find the lead with the loop connector buried in the wiring harness next to your fuse box. Remove the lead and connect it to one of the external hot terminals using your own nut (remove fuse box cover to expose your hot leads).
__________________
Every stop light is a staging light!
2021 Wolf Pup 16FQ.
2022 Tacoma TRD 4x4 Offroad. Husky Centerline TS32215 WDH Round Bar 400-600Lbs.
CURT 51180 Echo Bluetooth Brake Controller (Love it!).
2004 Ford F-150 STX 4X4 Tow Package, 273K For Pulling TT in the sand.
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09-20-2020, 03:49 PM
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#13
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Site Team
Join Date: Mar 2008
Location: Southwest Alabama
Posts: 9,850
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Quote:
Originally Posted by chengdave
Yes...sorry...you're absolutely right. 2014 Ram 4x4 1500. I'm not sure when it quit working as we drove it to Alaska pulling a trailer a couple years ago and it worked fine then...then traded in the trailer on a motorhome and I didn't tow during that time. This year, we are towing a new trailer, but until last week always had ac power on site. This week we did some dry camping and found the batteries weren't charging betwen sites at all....
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On your Ram the trailer tow fuses are F28, F29 & F30 in the underhood fuse box. F30 is a mini fuse. Be sure to test all those.
__________________
Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin! 
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09-20-2020, 04:44 PM
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#14
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Senior Member
Join Date: Feb 2019
Location: Indiana
Posts: 116
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Thank you! I'll have another looksee!!!
Quote:
Originally Posted by Bama Rambler
On your Ram the trailer tow fuses are F28, F29 & F30 in the underhood fuse box. F30 is a mini fuse. Be sure to test all those.
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09-21-2020, 05:05 AM
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#15
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Senior Member
Join Date: Feb 2010
Location: Southern MD
Posts: 282
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I didn't find out for over 7 or 8 years that my 2008 2500 GMC Sierra D/A wasn't charging either. My trailer repair guy fixed the issue right away as he knew exactly what to do.
__________________
Mike K
2019 Cedar Creek 34RL2 w/disc brakes
2017 GMC 3500 D/A, DRW, 40Gal Aux Tank
USN 76-82
Retired Dept of Navy: Navy/USMC Flt Test Engineer
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09-21-2020, 05:24 AM
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#16
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Senior Member
Join Date: Jun 2016
Location: Maurice, LA
Posts: 4,095
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Quote:
Originally Posted by Splashes3
I didn't find out for over 7 or 8 years that my 2008 2500 GMC Sierra D/A wasn't charging either. My trailer repair guy fixed the issue right away as he knew exactly what to do.
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It would be more helpful if you could tell us what he did to fix the problem.
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2009 Chevy Silverado 2500HD CCSB LTZ Diesel, Fumoto Oil Drain Valve, Turbo Brake activated, 39 gal Aux Tank W/ Fuel Pump transfer, Air Lift Loadlifter 5000 air bags.
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09-21-2020, 10:10 PM
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#17
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Senior Member
Join Date: Jun 2020
Location: On Long Island NY
Posts: 246
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Quote:
Originally Posted by DouglasReid
It would be more helpful if you could tell us what he did to fix the problem.
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See my post above. Chevy, GM are the same.
__________________
Every stop light is a staging light!
2021 Wolf Pup 16FQ.
2022 Tacoma TRD 4x4 Offroad. Husky Centerline TS32215 WDH Round Bar 400-600Lbs.
CURT 51180 Echo Bluetooth Brake Controller (Love it!).
2004 Ford F-150 STX 4X4 Tow Package, 273K For Pulling TT in the sand.
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09-21-2020, 10:18 PM
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#18
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Site Team
Join Date: Mar 2014
Location: Grayson County, Texas
Posts: 21,587
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Quote:
Originally Posted by SetauketJeff
See my post above. Chevy, GM are the same.
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You mean "Chevy, GMC", right? Are you sure that's what Splashes3's repair guy did or was there another issue?
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2015 FR Wildcat 295RSX / GMC Sierra
Nights Camped: '13 = 49/'14 = 74/'15 = 74/'16 = 85/'17 = 110/'18 = 111/'19 = 86/'20 =108/'21 = 115/'22 = 135/'23 = 78; Booked for 2024 = 69 |
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09-21-2020, 10:55 PM
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#19
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Senior Member
Join Date: Jun 2020
Location: On Long Island NY
Posts: 246
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Quote:
Originally Posted by Mr. Dan
You mean "Chevy, GMC", right? Are you sure that's what Splashes3's repair guy did or was there another issue?
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Current GM auto brands are Buick,Cadillac, Chevrolet, GMC, Holden and Wuling. Former GM automotive brands include La Salle, McLaughlin, Oakland, Oldsmobile, Opel, Pontiac, Hummer, Saab, Saturn and Vauxhall and Daewoo.
99% sure. They don't come hooked up and if you don't test pin 4, you'll never realize it. I'm actually considering putting a switch on mine. So when I'm not "trailering" there's less chance of shorts should the 7 pin outlet get wet.
BTW: If you use a wireless brake controller, pin 4 is what powers it.
__________________
Every stop light is a staging light!
2021 Wolf Pup 16FQ.
2022 Tacoma TRD 4x4 Offroad. Husky Centerline TS32215 WDH Round Bar 400-600Lbs.
CURT 51180 Echo Bluetooth Brake Controller (Love it!).
2004 Ford F-150 STX 4X4 Tow Package, 273K For Pulling TT in the sand.
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09-23-2020, 11:05 AM
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#20
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Senior Member
Join Date: Feb 2019
Location: Indiana
Posts: 116
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I checked my voltage with a good multimeter (Fluke 77) when I got home. I'm getting 4vdc without a load on the 12vdc terminal of my 7 blade truck trailer connector. I thought charging rate was according to amperage, not voltage. But then I never claimed to be an electrician.
What say ye???
PS: I did check my fuses, and all tested good. There's actually five fuses....including F53 and F81.
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