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Old 04-20-2020, 04:32 PM   #1
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Ford F250 2019 Trailer 12v Power Through 7-Way

Hi All,
I have a 2019 F250 with Trailer towing wiring equipped. I heard that to have the truck charge batteries when towing I need to install the required 30A fuse in the fuse holder box in the truck.

We pull a 2019 33' Classic.

Is this correct?
Will the power go through the 4 slot white, 12 volt to the trailer batteries of the 7way receptacle on the truck?

Does anyone have any information from anywhere that confirms this?

My next stop is a local Ford dealer to confirm. But I thought I would throw this out to anyone here too.

Thanks,

Mike
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Old 04-20-2020, 06:00 PM   #2
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Tow Package?

If you bought a new truck with a tow package - would imagine it is installed... But our 350 came to us used, and all the parts were there and working, so I can't say for certain. Easy to check, and good practice for when a fuse blows.
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Old 04-20-2020, 06:09 PM   #3
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Yes check with dealer and your owner’s manual. If you connect the truck to the trailer and have the truck motor running, won’t your trailer’s battery monitor show the charging voltage coming from the truck? Watch the monitor and turn the truck’s engine off, what happens?

Also you should be able to ID which pin on the electrical connection should be sending the charging voltage to the trailer. Using a good electrical meter, find that pin and confirm the voltage.

Good luck and please keep us advised.

Peter
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Old 04-20-2020, 06:47 PM   #4
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Quote:
Originally Posted by KarenMike View Post
Hi All,
I have a 2019 F250 with Trailer towing wiring equipped. I heard that to have the truck charge batteries when towing I need to install the required 30A fuse in the fuse holder box in the truck.

We pull a 2019 33' Classic.

Is this correct?
Will the power go through the 4 slot white, 12 volt to the trailer batteries of the 7way receptacle on the truck?

Does anyone have any information from anywhere that confirms this?

My next stop is a local Ford dealer to confirm. But I thought I would throw this out to anyone here too.

Thanks,

Mike
Mike, I just watched a video from the couple on “Keep Your Daydream” and he talked about fuses needed for the 7-pin on a Ford F-250.

Go to 05:50 on the video; he did a great job of explaining it: https://youtu.be/zuO8TuAwrwo

Good luck!
Jeff
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Old 04-20-2020, 07:59 PM   #5
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Great information from the other posts, I will address other considerations.

The power will pass through the cables and charge the trailer batteries, though more slowly than many realize.

So be aware that the tow vehicle is unlikely to completely recharge the trailer batteries because of relatively low available voltage and losses in the 12 gauge wires. Losses would be about 2.7 volts at 30 A and just under 1 volt at 10 amps. A typical tow vehicle, while running, will provide about 14 volts at the fuse box which is a bit low for optimal charging. If your battery begins the drive at 50%, the tow vehicle will deliver at most 12-15 amps at first but it will quickly drop as the batteries charge so assuming an 8 hour drive your batteries may be about 80-85% charged.

You'd need 14.7 V or higher so a tap directly off the unregulated side of the alternator to fully charge the batteries in an 8-10 hour drive.
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Old 04-20-2020, 08:39 PM   #6
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I have a 2019 F350. I did not have to add a fuse for the charge wire to work.
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Old 04-20-2020, 08:46 PM   #7
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Brian brings up a great point - charging through the 7-Pin is nominal at best.

If you want to charge the trailer's batteries while on the road your better off with a DC-DC charger like GMFL installed in the Long, Long Honeymoon's solar project. Here's one example: https://www.renogy.com/12v-60a-dc-to...ttery-charger/
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Old 04-21-2020, 05:36 AM   #8
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Quote:
Originally Posted by OTRA15 View Post
Yes check with dealer and your owner’s manual. If you connect the truck to the trailer and have the truck motor running, won’t your trailer’s battery monitor show the charging voltage coming from the truck? Watch the monitor and turn the truck’s engine off, what happens?

Also you should be able to ID which pin on the electrical connection should be sending the charging voltage to the trailer. Using a good electrical meter, find that pin and confirm the voltage.

Good luck and please keep us advised.

Peter
Peter,
Yes agreed. That was my next check although and I am not sure as dealer service may need more but I read on a Ford forum that there may be a relay that only activates the power once the truck is in drive.
Thanks.
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Old 04-21-2020, 05:38 AM   #9
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Jeff,
Quote:
Originally Posted by jeffmc306 View Post
Mike, I just watched a video from the couple on “Keep Your Daydream” and he talked about fuses needed for the 7-pin on a Ford F-250.

Go to 05:50 on the video; he did a great job of explaining it: https://youtu.be/zuO8TuAwrwo

Good luck!
Jeff
Yes I had messaged him as I had never heard this and he really didn't go into depth on the video and I had not seen this discussion on their videos in the past.
Thanks
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Old 04-21-2020, 05:43 AM   #10
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Originally Posted by BayouBiker View Post
Great information from the other posts, I will address other considerations.

The power will pass through the cables and charge the trailer batteries, though more slowly than many realize.

So be aware that the tow vehicle is unlikely to completely recharge the trailer batteries because of relatively low available voltage and losses in the 12 gauge wires. Losses would be about 2.7 volts at 30 A and just under 1 volt at 10 amps. A typical tow vehicle, while running, will provide about 14 volts at the fuse box which is a bit low for optimal charging. If your battery begins the drive at 50%, the tow vehicle will deliver at most 12-15 amps at first but it will quickly drop as the batteries charge so assuming an 8 hour drive your batteries may be about 80-85% charged.

You'd need 14.7 V or higher so a tap directly off the unregulated side of the alternator to fully charge the batteries in an 8-10 hour drive.
Agree. The wire size is not appropriate to correctly charge the batteries. The newer setups using a DC-DC charge monitor from TV to trailer all install a larger gauge wire to correctly charge with an appropriate alternator setup.
We don't boondock much and usually are on hookups so installing something like that for us isn't necessary. Iam just trying to understand the Ford setup as delivered to me and to understand the charge to battery from the truck.
Thanks.
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Old 04-21-2020, 05:46 AM   #11
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Jeff
Quote:
Originally Posted by jeffmc306 View Post
Brian brings up a great point - charging through the 7-Pin is nominal at best.

If you want to charge the trailer's batteries while on the road your better off with a DC-DC charger like GMFL installed in the Long, Long Honeymoon's solar project. Here's one example: https://www.renogy.com/12v-60a-dc-to...ttery-charger/
Yes I watched that and agree. My goal is to understand Ford and how the truck was built and why they don't have the 30 amp fuse already installed when the truck is noted as trailer wiring equipped as an add on.
Thanks.
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Old 04-21-2020, 08:46 AM   #12
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Peter,
Yes agreed. That was my next check although and I am not sure as dealer service may need more but I read on a Ford forum that there may be a relay that only activates the power once the truck is in drive.
Thanks.
Thanks . . . with two people you could check this "full scale model" quickly and easily, as I imagine you realize. If it appears to be charging correctly . . . no need to "overthink" this.

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Old 04-21-2020, 08:46 AM   #13
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volt meter would tell you
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Old 04-21-2020, 09:31 AM   #14
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Quote:
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JeffYes I watched that and agree. My goal is to understand Ford and how the truck was built and why they don't have the 30 amp fuse already installed when the truck is noted as trailer wiring equipped as an add on.
Thanks.
Good luck... I believe you came to the correct place for answers. I bought a F350 last November as I switched from a Sierra. The Ford dealer along with Ford Pass support on my questions about charging either my trailer batteries or my truck camper batteries has been a terrible experience.

Oh, and the best part, there is no battery gauge. The dealer explained I would get a warning light if there was an issue but that since I had a camper hooked up, they wouldn’t be able to answer any questions.
Wow.
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Old 04-21-2020, 09:34 AM   #15
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Just at dealer with same question

All,

Auxiliary power flows only when the vehicle is in DRIVE.

They offer a work around for a fee that is often being sold to contractors who work out of their trailer.
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Old 04-21-2020, 09:39 AM   #16
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volt meter would tell you
My 2019 F150, at least, has fancy pants electronics that don’t activate the charging pin until the truck decides you are actually driving and a trailer is plugged in. That’s to keep the trailer battery from trying to charge the truck battery if it were to discharge.

Anyway, on mine you had to have the engine running and put it in drive. I’m just mentioning this in case you were wanting to use a voltmeter to test. And, yes, the current provided isn’t much.
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Old 04-21-2020, 09:51 AM   #17
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Our F-150 FX4 with max tow (believe it or not) required us to have installed both the fuse and relay. Apparently they should have been in the glove box in a plastic bag yet to be installed (not) had to have the dealer install. The reason given was not everyone requires these right away??? SAY WHAT????
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Old 04-21-2020, 10:13 AM   #18
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Hi

Unfortunately there is no one magic answer to all of this. It seems to vary a bit from year to year, model to model, and maybe within a model year. In some cases, you only get power to the 7 pin when you are in drive, moving down the road, *and* have hit the brakes at least once. One *assumes* that once the power turns on, it does not switch off each time you come to a stop light ....

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Old 04-21-2020, 10:20 AM   #19
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JeffYes I watched that and agree. My goal is to understand Ford and how the truck was built and why they don't have the 30 amp fuse already installed when the truck is noted as trailer wiring equipped as an add on.
Thanks.
My 2017 F250 KR came with this fuse. In my 2012 Platinum F150, it did not. I found out when my battery was dead in Canada in 2014 after couple days driving...I called Ford in Montana and service manager told me to look in certain fuse location (don't remember which one} and sure enough, no fuse. I was told Ford does not include this one since many trailers (boat for example) don't use/need that connection, and it is costly overall to include....I understand it was not only Ford, but RAM and Chevy also? Don't know currant status, but my 2017 KR does have.
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Old 04-21-2020, 10:39 AM   #20
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Fuse for 7-Pin

Check your fuses, or have the dealer check them.


I have a 2005 Chevy Silverado. I bought a 2004 Airstream and pulled it from Sacramento down to Orange County (about 8 hours). I was livid because the trailer didn't get charged during that time.


I went into the Chevy dealership and was advised that that fuse is not put in with a new vehicle and you have to add that fuse, which they did. I saw the empty fuse location and physically watched them put in the correct fuse.
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