Why Is Taillight Converter Needed for Trailer Wiring on 2005 Toyota 4Runner

Question:

I have a 2005 4Runner. Im not sure what the electronic converter does. If the tail lights on the vehicle and trailer are both 12 volt, then why is it necessary to use an electronic converter?

asked by: Mike H

Expert Reply:

The converter aspect of the trailer wiring for your 2005 Toyota 4Runner is not a voltage converter. Instead it converts the taillight signals to match what trailer wiring requires. Trailer stoplight and turn signals are carried on the same wire and some vehicles have the turn signals and the stoplights carried on two different circuits.

That's where the converter of the part # HM48925 comes and changes the vehicles separate circuits to combined and allows the trailer taillights to function properly.

expert reply by: Jameson C