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Old 12-17-2015, 12:52 PM   #1
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F53 7 pin plug 12v

Does anyone have an idea where the fuse or breaker might be for the 12v+ wire on the 7 pin tow connector for a 2013 F53?

I'm going to wire a towed charge line (breaker on towed battery) and need to know if the RV has a fuse or breaker already installed.

Thanks for the assistance.
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Old 12-17-2015, 12:55 PM   #2
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I would think that's a Ford fuse and if so would be in the engine compartment. Take a look at you ford manual as it has all the fuse schematics in it.
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Old 12-17-2015, 01:04 PM   #3
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Inside, just under the dash. You should have a removable lid on the dash near the drivers side. (reg.20 amp fuse on mine)
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Old 12-17-2015, 01:15 PM   #4
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Originally Posted by IdahoSRT10 View Post
Inside, just under the dash. You should have a removable lid on the dash near the drivers side. (reg.20 amp fuse on mine)
Is it a stand alone fuse or in a box with other fuses?
Thanks.
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Old 12-17-2015, 01:17 PM   #5
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Power distrubution box fuse #13. It's a 30 amp fuse for trailer electric brakes. The distrubution box is on the forward side of the chassis firewall. The fuse panel is inside the coach above your left foot on the rear side of the fire wall.

https://www.fleet.ford.com/truckbbas...3/maintoc.html

Click on the link for the F-53 and page down to the last to pages of the PDF for electrical info.
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Old 12-17-2015, 01:22 PM   #6
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Here's a manual. Page 74 is where the fuses are.

http://www.fordservicecontent.com/Fo.../13motom1e.pdf
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Old 12-17-2015, 02:14 PM   #7
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It's in a an approx. 5" x 5" black box. Mine has a snap off cover for the smaller fuses as shown in pic. Yours may be similar.
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Old 12-17-2015, 02:21 PM   #8
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As far as I know, Ford does not supply a charge line on the F53 chassis. That's left up to the "body builder"- in this case, Fleetwood. Ford does supply a charge line on an E450 chassis.
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Old 12-17-2015, 03:54 PM   #9
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It's in a an approx. 5" x 5" black box. Mine has a snap off cover for the smaller fuses as shown in pic. Yours may be similar.
Thanks for the info! I'll check it out.
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Old 12-17-2015, 06:52 PM   #10
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WeBRVing , l1v3fr33ord1 is correct for some unknown reason Ford does not include the 12V charge line on the F53 chassis. The coach build has to supply it, if there is one.
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Old 12-17-2015, 07:15 PM   #11
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On my F53 based coach, there is 12 VDC on the 7 pin connector B+ pin with ignition key in run position only, and I believe it is fed from a 20 Amp fuse on the F53 Fuse Panel 1 (FP1). This is different than the fuse that is provided for an optional add-on brake controller for electric trailer brakes.

I use it for a charge line so I don't have to pull fuses on my toad. I recommend you further protect it with a 15 Amp fuse in your toad, and this gives you the added benefit of being able to use a 14 gauge wire size in the toad for the charge line.

Another reason to have the 15 amp fuse in the toad: Its a real pain to access FP1 up in front of the driver's seat , at least in my coach. My hope is that if something happens, the 15 amp fuse in the toad will be the one that blows, and I put it under the toad hood where I can get to it.

At least in my coach the B+ wire in the harness going to the 7-way is only 12 gauge so the biggest it could be fused is 20 Amp. Of course yours could be different.
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Old 12-17-2015, 08:12 PM   #12
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True Ford does not supply a dedicated charge line. What Ford does provided is the a 12VDC chassis power wire to the rear of the chassis for the coach builders to utilize at the 7 pin trailer connector. Normally this pin is used for electric brakes but can also be tapped into for other purposes such as maintaining a battery charge. I used the power for a rear view camera and wireless transmitter on the back of my toad.
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Old 12-17-2015, 09:44 PM   #13
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Quote:
Originally Posted by Sweetbriar View Post
True Ford does not supply a dedicated charge line. What Ford does provided is the a 12VDC chassis power wire to the rear of the chassis for the coach builders to utilize at the 7 pin trailer connector. Normally this pin is used for electric brakes but can also be tapped into for other purposes such as maintaining a battery charge. I used the power for a rear view camera and wireless transmitter on the back of my toad.
There are different pins in the 7 way for Electric Trailer Brakes and to provide steady 12 volts to a trailer for any purpose. The steady 12 volt pin is not used for the normal type of electric trailer brakes, see the wiki link below.

With electric trailer brakes, they must be driven by a Trailer Brake Controler that generates a variable voltage between zero and full battery to the electric brake actuators, that voltage is determined by the trailer brake controller sensing brake pedal activation in the coach, and during brake pedal activation it controls the output voltage by sensing rate of de-acceleration. The trailer brake voltage increases with harder braking sensed by the resultant higher de-acceleration. The controller goes under the dash so the driver can adjust the voltage output curve with an adjustment dial on the controller so that the trailer brakes don't lock up when doing hard braking and lose stopping power due to lock up. The adjustment dial gets set based on the weight of the trailer - as high as it can be without the trailer wheels locking up when hard braking. Generally the heavier the trailer the higher the adjustment is set.

The wire going to the 7 way trailer brake pin is part of the Ford F53 OEM chassis wiring and the other end of that wire is under the dash not connected unless one has a add on trailer brake controller. Without the add on trailer brake controller that pin will read open.

The trailer brake wire will typically be 10 gauge as is the the wire under the dash coming from the trailer brake fuse that is intended to be wired to a trailer brake controller, to handle worst case 3 or 4 axle trailer brake setups that can draw up to 30 amps under full braking power.

https://en.wikipedia.org/wiki/Trailer_brake_controller

http://www.etrailer.com/Brake-Contro...sha/90195.html
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Old 12-19-2015, 05:01 PM   #14
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Quote:
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It's in a an approx. 5" x 5" black box. Mine has a snap off cover for the smaller fuses as shown in pic. Yours may be similar.
Yup, that's where it is. Thanks a million.
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