How to Adapt a 4 Round Trailer Plug to a 2018 Silverado 2500

Updated 07/27/2021 | Published 07/26/2021

Products Featured in This Question

7- and 4-Pole Trailer Connector Socket w/ Mounting Bracket - Vehicle End

(2641)

$43.95

Pollak Heavy-Duty, 4-Pole, Round Pin Trailer Wiring Socket - Metal - Vehicle End

(139)

$11.00

Wesbar 4-Pole Flat Connector w/ Jacketed Cable - Trailer End - 8' Long

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$21.74

Bargman 7-Way, RV-Style Connector w/ 6' Long Coiled Cable - Trailer End

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$56.94

Question:

Have a 2018 Silverado 2500HD, 2000 Sun-Light pop up pick up camper. Pop has round 4 pin. I know I need to feed clearance lights on camper, etc. Where does power come from on truck to feed camper?

asked by: Brad

Expert Reply:

If you have a 7 Way connection, the 2 o'clock position will be your 12 volt power, the 3 o'clock position will be the right turn signal and right brake signal, the 5 o'clock position will be your brake controller output, the 7 o'clock position will be your ground, the 9 o'clock position will be the left turn signal and left brake, the 11 o'clock position will be the tail light and running lights, and the center position will be the auxiliary circuit.

If you have a 4 Flat connection, the green wire is for the right turn signal, the yellow is for the left turn signal, and the brown wire is for the brake signal.

From what I could find, you should have both on your 2018 Chevrolet Silverado 2500. However, the 4 Round plug on your trailer is not a very common plug. To adapt this to a 7 way, you will need to connect the # WG54006-043 to the # PK11404. To adapt it to a 4 flat, which will be easier, you will again need the # PK11404, but then you will need the # W787268.

expert reply by: Lazer S