Can 12 Volt Power Be Run With a 4 Flat Trailer Plug?

Question:

I want to hook it straight to a 12 volt battery which 2 wires to hook to?

asked by: Ronnie

Expert Reply:

Typically a 4 Flat plug will not have a lead that goes to a battery as the White wire is the Ground, The Yellow is Left Turn/Brake, Green in Right Turn/Brake, and Brown is Running Lights. If you were using this for a different application, you can technically use any of the wires to run to the battery, but I do recommend using the White as the Ground as this is the standard.

If you are using this as trailer wiring, I recommend going a different way. The Deka Jacketed 6-Wire # DW04906-1 will use 14 gauge wires and may suit your needs better. This can then be paired with the Hopkins Wiring Harness with 5-Pole Flat Trailer Connector # HM37918 on the trailer side, and the Curt 5-Pole Flat Vehicle Wiring Harness w/ Mounting Bracket # C58545 on the vehicle side. The 5th pole on these is usually used for reverse lights, but can also be used for the 12 volt power in your case.

expert reply by: Lazer S