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Old 07-13-2019, 10:42 AM   #1
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2018 F350 Charge to Trailer

I recently had need to confirm my truck is charging my 5er. I had a RV tech tell me that many F350ís come without the fuse installed to 12v charge circuit I checked and there is no voltage on 7 pin receptacle.
I then looked and there is no fuse in location for 12v trailer charge. Then I looked at ford manual and read online that if truck is setup with integrated brake controller and mine has tow package with gooseball then the fuse is unneeded. What I read said truck needs to confirm trailer is connected and brake pushed once then sends power to trailer.
Can anyone confirm this and/or tell me how to confirm with simple volt meter?
Regards Ron
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Old 07-13-2019, 12:34 PM   #2
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I believe you may be talking about two different things. The brake controller is sending power to the brakes, not the charge circuit. There is a relay that must be installed under the hood on the firewall. It is usually shipped in a plastic bag with your jack and tire changing instructions, at least it was on my last two Fords. Mine were pink relays and without them the lights and brakes worked great but the trailer batteries would not charge.
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Old 07-13-2019, 12:34 PM   #3
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Originally Posted by baranski37 View Post
What I read said truck needs to confirm trailer is connected and brake pushed once then sends power to trailer.
Can anyone confirm this and/or tell me how to confirm with simple volt meter?
Regards Ron
Yes, this is correct. The BCM won't send voltage unless it detects the load from the trailer brake lights.
Easy to test:
Run down the trailer battery some - run the lights, run the slides in and out a few times. Check voltage with a volt meter at the trailer batteries.
Hitch the truck, leave the engine running, press on the brake pedal.
Check the trailer battery voltage - it should be higher. Voila
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Old 07-13-2019, 12:42 PM   #4
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I can only confirm I have heard this before so I can believe it.

Wouldn't a test be as simple as taking a tester to all the pins with someone in the truck using the brake, then the turn signals, lights and mapping the pins. All the pins should be active.

Or look in the fuse box with the owners manual and see if you can determine which fuse is missing?

FYI - there was a diagram of the pins on this forum in the last few weeks with the mapping.
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Old 07-13-2019, 12:59 PM   #5
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I've had my truck for 2 years now and I always suspected the charge line was not working. It has the camper and fifth wheel package. The voltage as shown on my inverter after a day on the road would always be down by a full volt or so at the end of the day. The inverter runs our residential fridge. I decided to try a 30 amp fuse in slot 27, ran the voltage down to 12.6, hooked up, pressed the brake pedal for 7 seconds and the voltage showed 13.3. This tells me the charge line is working. Since I didn't try it without the fuse I can't really confirm it wasn't working but I'm pretty sure it wasn't.
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Old 07-13-2019, 02:01 PM   #6
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Originally Posted by tuffr2 View Post
I can only confirm I have heard this before so I can believe it.

Wouldn't a test be as simple as taking a tester to all the pins with someone in the truck using the brake, then the turn signals, lights and mapping the pins. All the pins should be active.

Or look in the fuse box with the owners manual and see if you can determine which fuse is missing?

FYI - there was a diagram of the pins on this forum in the last few weeks with the mapping.
No - the 12v Charge line WILL NOT BE ACTIVE until the BCM Detects trailer brake lights and allows the truck to charge the trailer. And you can't measure the pins if the connector is plugged in, unless your on the other side of the trailer - where the pigtail ends I suppose.

Its not that complicated of a change, but man has it caused a ton of confusion on all the forums.
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Old 07-16-2019, 08:47 PM   #7
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There seems to be a bulletin which confirms that no additional fuses beyond the one that powers the TRM are needed for 12v power to the trailer: https://static.nhtsa.gov/odi/tsbs/20...95997-2532.pdf
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Old 07-18-2019, 09:21 AM   #8
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There seems to be a bulletin which confirms that no additional fuses beyond the one that powers the TRM are needed for 12v power to the trailer: https://static.nhtsa.gov/odi/tsbs/20...95997-2532.pdf


So if I use the 7 pin connector to connect a slide in camper will it charge?
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Old 07-18-2019, 10:09 AM   #9
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So if I use the 7 pin connector to connect a slide in camper will it charge?
Thatís a good question. If your truck messages that a trailer is connected when you plug in your slide-in camper, it should work. If not, I doubt that you would get a charge. Just my guess...
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Old 07-18-2019, 11:54 AM   #10
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If the slide in has rear brake/running lights (most do) then I'd expect it to consider it a trailer and charge.
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Old 07-24-2019, 10:28 AM   #11
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I did find time to confirm once hooked up to fifth wheel, after holding brakes down 7 seconds the battery jumped to 13.8 volts. There are no fuses installed in spot 27. Ford 2018 F350 with tow package.
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