How To Connect A 7-Pole Diode Wiring Cable To A 4-Pole Connector On An RV

Updated 05/04/2022 | Published 04/30/2022

Products Featured in This Question

Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles - 7-Way to 6-Way Straight Adapter Cord

(3104)

$204.35

10 Gauge Wire - Blue Primary - Per Foot

(103)

$1.80

Deka Jacketed 2 Wire, 10 Gauge, Brake Wire - per Foot

(321)

$3.64

Adapter 4-Pole to 7-Pole and 4-Pole

(658)

$58.71

40 Amp In-Line Circuit Breaker - Perpendicular Mount Bracket

(97)

$9.87

Deka Heat Shrink Butt Connector - 12-10 Gauge - Nylon Insulation - Yellow - Qty 10

(1095)

$12.55

Question:

hooked up system but not working when i hook up straight cord my RV has a 4 prong hook up not a 6 r7 what should ido

asked by: Lennard S

Expert Reply:

Since you already have a 4-pole wiring harness on your RV you would just need to install a 4-pole to 7-pole Adapter # 37185 to get a 7-way connection at the end of your motorhome and allow you to hook up your straight cable from your Roadmaster 4-Diode Universal Wiring Kit # RM-152-98146-7.

To install this kit you'll need to make the following connections:

The 4-pole connector to the one already on your RV.
The blue wire to the brake controller.
The purple wire to the reverse light circuit.
The white wire to bare metal for a ground.
The black wire to the battery with an fuse inline like # 9510.

You'll need some additional 10AWG wire to make these connections so I recommend also picking up some # 10-2-1 and # 10-1-1 as well as some heat shrink butt connectors # DW05745-10 for a water-tight connection.

Once this kit is installed you'll have a 7-way on your RV to allow your Roadmaster 4-Diode Universal Wiring Kit # RM-152-98146-7 to properly operate, sending your braking and turning signals through your towed vehicle.