Adding Reverse Lights To Semi Trailer 48 Foot Flatbed Through Connecting to 7-Way

Updated 02/20/2025 | Published 02/28/2018

Question:

If I wanted to install reverse lights on my semitrailer 48’flatbed what connection to I come off of on the 7 way?

asked by: James

Expert Reply:

If you use the 7-way that is used for commercial/industrial/agricultural application like # PK11720 or the RV/standard 7-way like # HM47210 you will need to utilize the same location. The reverse signal should be connected to the center location of either application.

You will simply need to make sure your wiring corresponds with the function locations. I've attached a photo to assist. For a 7-pin that normally does not have a reverse light, that means utilizing the auxiliary in the middle for that function.

expert reply by: Jason S

click to enlarge

Mike

2/20/2025

if I use the center pin for back up lights will I lose the abs for the trailer?

Jon G.

2/20/2025

@Mike Yes, if you have the commercial/agricultural 7-Way pin system and you remove the connection for the Aux/ABS power and replace it with back up lights then you will lose the ABS feature if you currently have it.