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Old 08-17-2013, 05:05 PM   #1
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4 flat to 7 pin converter

My truck has the 4 flat connector and naturally the TT has the 7 pin. Will I run into any issues using an adapter?

If so, what can I do to correct my problem?

Thanks in advance,


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Old 08-17-2013, 05:08 PM   #2
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4 flat is only going to handle lights. Does your TT have brakes?

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Old 08-17-2013, 05:55 PM   #3
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The 7 pin adds brakes, possibly back up lights and a charge line from the tow vehicle. You need to get a proper 7 pin plug wired for the vehicle.

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Old 08-17-2013, 05:58 PM   #4
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You need to put a 7 pin receptacle on the TV(tow vehicle) and wire the additional circuits into the TV. As the response above stated the 4 pin flat only handles ground, left brake/turn, right brake/ turn and tail lights. Most RV plugs have the same four circuits as the four pin flat as well as a circuit for the electric brakes, a 12vdc hot wire to charge the battery on the TT and an additional circuit for additional options. You will need to add a brake controller in the TV as well, so you can control the brakes on the TT.
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Old 08-22-2013, 05:39 PM   #5
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An adapter won't work to give you 7-pin functionality. Instead you need at least three things:

1) A 7-pin wiring harness and plug made to fit your year/model of tow vehicle. You can get that at
Trailer Wiring | etrailer.com
or other trailer parts supplier. Also the parts department at the dealership for your truck brand probably has what you need in stock.

2) A trailer brake controller installed and wired into your truck. Best is probably the factory integrated trailer brake controller (ITBC) made for your exact truck, but less expensive aftermarket brake controllers are also available.

3) Fuses and relays added to the truck's power distribution box and/or fuse box.

Unless you are good with wiring automotive electrical stuff, then best is probably to have a good RV dealer or trailer retailer install the wiring harness and brake controller with required fuses and relays.
Grumpy ole man with over 50 years towing experience. Now my heaviest trailer is a 7,000-pound enclosed cargo trailer, RV is a 5,600 pound Skyline Nomad Joey 196S, and my tow vehicle is a 2012 F-150 3.5L EcoBoost SuperCrew.
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Old 08-22-2013, 06:59 PM   #6
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Thanks guys! Got the Reese kit that has all the fuses, relays, and correct 7 pin harness. Also bought the harness to plug in under the dash for the brake controller. All from etrailer.com!

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