If all you want is a tail gate light and not all brake, turning, running lights just connect to the 12v wire on both sides of the bed. If you want just turn signals and brake do not connect the running light wire coming out of the 4 pin to anything. (If all 4 wires are not connected the truck doesn't think a trailer is attached!). Also you can buy the curt relay for less than $100 at etrailer. When I was in high school a brand new six cylinder auto with heat and AC was $1800 which was not as well equipped as an XL maverick. Makes a $100 item less than $10 in actual value. Of course McDonald's mini burgers were 6/$1 on Wednesdays special. When I was 11 my first job paid $12.50 plus lunch/5.5 day week during summers.
The truck throws error codes if more or less current is drawn than designed. So you have to use relays on existing circuits to activate additional lights powered by a separate hot wire. Easiest is curts pre built setup.
No. This is bad information. I've successfully done it in my 22. What I said was correct.
