Installing Battery Charge Line for Flat Towed Vehicle with 4-Way Connector

Published 11/20/2018

Products Featured in This Question

Hook Probe Circuit Tester

(66)

$13.42

Roadmaster 7-Wire to 6-Wire Flexo-Coil Kit

(260)

$99.81

Roadmaster Battery Charge Line Kit for Towed Vehicles

(1331)

$36.90

Question:

On the Hopkins 7 way coiled adapter to4/5 way if hooking to a 4way on a toad car could the extra pin on the 5 way be used a charger line on the toad. thanks,

asked by: Wyiet

Expert Reply:

I do have a solution for you, however you won't be able to run a charge line from the 5th pin on the Hopkins Heavy-Duty Trailer Coiled Wire Adapter # HM47025 that you referenced. The 5-Way on this adapter will plug in just fine to the 4-Way on your toad but the open 5th pin carries the reverse light function and not the 12V power circuit from the 7-Way on your RV.

In order to add a charge line to your setup the best solution will be to use the Roadmaster 7-Wire to 6-Wire Flexo-Coil Kit # RM-146-7. This kit includes a 6-Way round connector that you will install on your toad. You will just need to cut off the existing 4-Way connector and connect the wires to the 6-Way. I have attached an image from the instructions manual to assist. Just be sure to match the wires up by function using a circuit tester like # PTW2993.

With the 6-Way in place you can use the included adapter cord to connect it with the 7-Way on the RV. The center pin on the 6-Way is wired for 12V power so you can then use the Roadmaster Battery Charge Line Kit # RM-156-25 to allow up to 15 amps from the RV's battery to be used to maintain the charge on the battery in your towed vehicle.

expert reply by: Chris R