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Old 09-20-2017, 05:17 PM   #1
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Flat 4 plug to 7 pin round plug trailer hookup

We have a 2004 Georgetown 370TS. It has a flat 4 wire harness to plug a trailer into. We just bought a 2013 Honda CRV that is totally setup for 4 down towing and included everything needed (Blue Ox tow bar, base plate installed, switch to turn off the necessary fuse, electric hookup to run off the MH's electrical to power Brake Buddy, lights, etc., Brake Buddy with all necessary hardware including wireless monitor, break-away safety chains and brake, etc.) It has a round 7 pin connector so I need to swap our 4 pin flat connector out for a 7 pin round. Do the older Georgetown's (Ford F53 chassis)have a plug in harness or do I need to wire it all up?

Thanks in advance for any help.
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Old 09-20-2017, 06:41 PM   #2
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Quote:
Originally Posted by funmoneypit View Post
We have a 2004 Georgetown 370TS. It has a flat 4 wire harness to plug a trailer into. We just bought a 2013 Honda CRV that is totally setup for 4 down towing and included everything needed (Blue Ox tow bar, base plate installed, switch to turn off the necessary fuse, electric hookup to run off the MH's electrical to power Brake Buddy, lights, etc., Brake Buddy with all necessary hardware including wireless monitor, break-away safety chains and brake, etc.) It has a round 7 pin connector so I need to swap our 4 pin flat connector out for a 7 pin round. Do the older Georgetown's (Ford F53 chassis)have a plug in harness or do I need to wire it all up?

Thanks in advance for any help.
I can't help with the harness part of the question, but if you do have to run all the wires and make the connections I would want to first make sure you know exactly how your new to you Honda was wired. In otherwise do you know what pins on the 7 way connector are for?

First thing I would do is figure out which pin on the 7 way connector is ground. Then if you are sure about that then apply 12 volts to each pin and see what happens. Record all pin outs. Don't trust any wiring diagrams you see. Someone could have wired that plug many different ways. Once I was sure what wires went to which function, then I would make the the necessary wiring connections inside a water tight electrical box.
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Old 09-20-2017, 07:00 PM   #3
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I can't help with the harness part of the question, but if you do have to run all the wires and make the connections I would want to first make sure you know exactly how your new to you Honda was wired. In otherwise do you know what pins on the 7 way connector are for?

First thing I would do is figure out which pin on the 7 way connector is ground. Then if you are sure about that then apply 12 volts to each pin and see what happens. Record all pin outs. Don't trust any wiring diagrams you see. Someone could have wired that plug many different ways. Once I was sure what wires went to which function, then I would make the the necessary wiring connections inside a water tight electrical box.
Absolutely am going to do this. I don't trust anyone's wiring but my own. I don't have the CRV/equipment at home yet as we pick it up tomorrow. I think there will only be 5 wires needed. The lights (3 wires), a 12 volt power to power the Brake Buddy (there is a dedicated wire for it so it doesn't use toad power) and then a ground. I will definitely have to figure out which five out of 7 are being used.
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Old 09-20-2017, 07:06 PM   #4
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funmoneypit-

Ford has provided the wiring for a trailer on the F-53 chassis since at least the early 2000s.

The Ford wiring ends in two connectors at the rear of the frame, usually inside the left frame rail. Ford provides the "coach builder" with pigtails to plug into the connectors. The "coach builder" decides which wires to extend to the trailer hitch connector. It sounds as if on yours that Forest River (the "coach builder") extended only the

LEFT TURN/STOP (yellow)
RIGHT TURN/STOP (dark green)
PARKING LIGHT (brown/white)
GROUND (white)

wires, so these are probably unterminated on the pigtails:

TRAILER ELECTRIC BRAKE (dark blue)
BACKUP (black/light green)

Note that Ford does not provide a 12V charge line on the F-53 chassis. If there is one, it is run by the "coach builder." If yours does not have one, you'll have to run a cable for that purpose from the coach battery to the new hitch connector, making sure it is of adequate gauge and properly fused at each end.

Here's a page to which I often refer when I want to know about connectors, pins and signals.

Note: While there's nothing incorrect about a 7-pin connector with round pins, the "RV standard" 7-pin connector uses flat pins.

See also this post I made, with more information, including diagrams. And this post, although some of the information is repeated.
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Old 09-20-2017, 07:17 PM   #5
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Thank you l1v. I got under it and did see the two plugs under the left frame rail. I guess I have to just run the 12 volt hot wire then. I do appreciate the links.

The "round" I was referring to was the plug itself, not pins.

Again, thanks for the info.
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Old 09-21-2017, 05:29 PM   #6
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https://www.etrailer.com/Wiring/Tow-...RoCaFUQAvD_BwE
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