Circuit Configuration in RV-Type 7-Way Trailer Wiring

Updated 05/11/2020 | Published 01/27/2019

Products Featured in This Question

Mighty Cord 7-Way RV-Style Trailer Connector w/ Molded Cable - Trailer End - 6' Long

(221)

$38.33

Question:

is the 7 way plug, standard or RV wiring

asked by: Timothy S

Expert Reply:

Your photo shows the 7-way trailer wiring setup that we call the RV format. The photo I linked shows an actual trailer plug # A10-7W6 like yours and the circuit arrangement is the same as your photo diagram. For reference, the included article covers all wiring formats in detail.

The item you referenced, replacement OEM wiring harness # 118242, is configured in the same way.

expert reply by: Adam R

click to enlarge

Matthew H.

5/4/2020

HelloI have a 09 F150 and I am the second owner. From what i read is Ford doesnt install the Relay and fuse in the truck. And the previous owner didnt leave them in the glove box. What fuses do i need? Some type of relay? Whats the part number? Please

Chris R.

5/7/2020

Which particular circuit on the 7-Way are you needing a fuse/relay for? All of the fuse locations should be listed out in your truck's owner's manual, but if you can tell me what specific circuit you're looking for I would be happy to try and track this info down.

Matt H.

5/8/2020

@ChrisR From what I've researched on the 09 f150. Ford didn't put in the fuses in for the 7way. I'm needing to know what fuse and relay I need to use the 7way, to pull my rv. Hope that makes sense.

Chris R.

5/11/2020

The owner's manual for your F-150 lists several fuses and relays for the various circuits on the 7-Way. Is every pin/circuit on the 7-Way dead? According to the manual inside the main power dist. box under the hood there is a: trailer lamp relay in the #6 position, 12V trailer circuit relay in the #9 position, 30A trailer brake circuit fuse in the #17 position, 30A 12V trailer fuse in the #21 position, 20A trailer park relay in the #31 position, trailer left turn/stop relay in the #37 position, trailer right turn/stop relay in #38, 20A fuse for stop/turn in #45 position, and a 15A fuse in the #58 position for trailer backup lamps.