12 volt aux power lead to 7 PIN CONNECTOR - Diesel Forum - TheDieselStop.com
 
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post #1 of 13 (permalink) Old 06-28-2017, 08:40 AM Thread Starter
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12 volt aux power lead to 7 PIN CONNECTOR

I have a 2017 F250 Diesel. I bought a motorcycle trailer and the interior lights dont work. I took the truck into the trailer dealer, and they stated the line for this on my truck isnt hot. They stated it was fuse 27. I looked and it seems like there is a fuse in position 27 but its a little difficult to get to. Is this the right fuse or should I look elsewhere?
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post #2 of 13 (permalink) Old 06-28-2017, 11:48 AM
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Check and see if you have a module also. (Not all trucks do, I'm told.) We've had an issue with ours as we got a trailer fault which threw codes which, in turn, disabled trailer battery charging. In our case, not only does the truck have to recognize a trailer, but also requires that brakes be applied before battery charging occurs (in addition to no codes). Probably not your issue, but it's also not as simple as it use to be, either. Here's the info I was given: https://ford.oemdtc.com/2482/trailer...d-f-super-duty

Good luck! David

2001 F250 7.3L PSD Lariat CC 4x4; Sold Jan 2009
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post #3 of 13 (permalink) Old 07-06-2017, 02:50 PM
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The truck needs to be running to feed that pin, too.

Current:
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post #4 of 13 (permalink) Old 07-06-2017, 08:03 PM
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Quote:
Originally Posted by davydee View Post
In our case, not only does the truck have to recognize a trailer, but also requires that brakes be applied before battery charging occurs (in addition to no codes).
That makes absolutely no sense. Why should it be required that you be stopped with the brakes applied to charge a trailer battery? It makes more sense to charge while running down the road, not when you're sitting getting zero mpg.

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post #5 of 13 (permalink) Old 07-17-2017, 01:48 PM
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Originally Posted by klhansen View Post
That makes absolutely no sense. Why should it be required that you be stopped with the brakes applied to charge a trailer battery? It makes more sense to charge while running down the road, not when you're sitting getting zero mpg.
I agree, that makes no sense.

Current:
  • '17 Ford F-350 King Ranch Crew Cab long bed 6.7l V8 (440/925)
  • '06 Yamaha FJR1300AE motorcycle
  • '03 Thor Jazz 2850BH Fifth Wheel

Past:
  • '11 Ford F-350 King Ranch Crew Cab long bed 6.7l V8 (400/800)
  • '08 Ford F-350 King Ranch Crew Cab long bed 6.4l V8 (350/650)
  • '04 Ford F-250 King Ranch Crew Cab long bed 6.0l V8 (325/560)
  • '01 Ford F-250 Lariat Crew Cab short bed 6.8l V10 (310/425)
  • '99 Ford F-250 Lariat Crew Cab short bed 6.8l V10 (275/410)
  • '97 Ford F-150 XLT Supercab short bed 4.6l V8 (220/290)
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post #6 of 13 (permalink) Old 07-17-2017, 06:59 PM
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I agree, that makes no sense.
Here's the actual document quote, "For trailer charging to operate, the TRM must detect a trailer is connected and a brake pedal input before charging will be present at the trailer connector."

David

2001 F250 7.3L PSD Lariat CC 4x4; Sold Jan 2009
2009 F450 Pickup Lariat Plus w/Nav, 4X4 Off-Road Pkg; Sold Feb 2017
2017 F350 6.7L PSD CC DRW Platinum 4x4

2011 MS 36RSSB3 w/vanity slide and a nice 4,285 lbs of hitch weight
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post #7 of 13 (permalink) Old 08-30-2017, 09:21 AM
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Check all the trailer related fuses. I had the same issue, i added the extra fuse and played with the brake, the lights still wouldnt work. I stumbled on a blown fuse for the tail/turn lights #72 which worked fine but after i replaced the fuse the aux lights in the trailer worked made no sense but everything works now
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post #8 of 13 (permalink) Old 08-31-2017, 06:43 AM
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I have to agree with davydee. Had trouble with charging until I found about the right procedure. I now make the trailer connection and then step on the brake. No troubles with charging anymore.

Dave

2017 F350 Dually
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post #9 of 13 (permalink) Old 08-31-2017, 01:39 PM
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I've also found that doing a brake test using the brake controller itself does not set the power on - it has to be the brake pedal. Not sure why and the diesel tech I spoke with in Limon Co (not a Ford Dealer - a Heavy Duty Truck repair shop) had never heard of such a thing (BTW I was referred to him by a fellow Ford owner who lives in Limon. I spoke with him at the local gas station while fueling the beast. Regardless, he told me the guy was super with diesels and worked on all makes and sizes of diesels.). In any case, this step on the brake pedal to activate your trailer charge circuit is definitely not publicized by Ford, nor well know either. Thanks for getting the word out.

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Last edited by skypilot; 08-31-2017 at 01:42 PM.
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post #10 of 13 (permalink) Old 09-04-2017, 03:35 PM
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When you take the shift lever out of "park" don't you have to apply the brake? I towed a 36ft 5th wheel camper 14000 miles this summer and never had problems with the trailer battery not charging. I think the brake application is only to activate the charging then the system is good and the battery on the trailer is all set.
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post #11 of 13 (permalink) Old 10-09-2018, 10:51 PM
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I used an electric brake magnet that I connected to a 7-way trailer connectors. Them, it will charge you battery. See this video:

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post #12 of 13 (permalink) Old 07-19-2019, 09:40 AM
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I fixed this exact problem last weekend.

Replace fuse 65 (30 amp type M fuse). After check "+" on 7 pin trailer after stepping on the brake once. Should have 13.7-14 volts.
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post #13 of 13 (permalink) Old 07-19-2019, 11:34 AM
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If you have a trailer tow module and are tired of dealing with this nonsense I see no reason why you couldn't re-wire the "charge" wire to an upfitter switch if equipped. Has anyone done that?


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