I just installed a turn signal switch yesterday,so I will share with you my expierience.
My switch came from one of the vendors,( I don't remember witch one ,it was purchased 12 yrs ago). It had 7 wires Plus a fused power for the 3 terminal blinker can.
The instructions were rather vague,(that's why it sat for 12yrs). After staring at the instructions and straching my head for a while I determined that the best course of action was to just use my common sense and do it my way.
Look at your wires and seperate the front two from the rear to, then you will be left with 3 wires that connect to the blinker can and one power wire. Let us deal with the four wires that go to the lights first.
Determine what color wires go where,(ex. yellow/right front, brown/ left front, green/right rear, orange/left rear)Your colors ma vary. Go to NAPA and get a roll of wire the same color as the leads on the switch, some male and female conectors.
Now lets have some fun.Run one wire of each color lead to each light (ex. Y/rght frt,Brwn /lft frt,and so on)when you have finished that, you have wired your turn/brake lights.Caution here, you must have dual terminal light sockets that use a 1157 light bulb,(but you already know that right).The wires get connected to the brighter side of the bulb.
Next connect the blinker can look at the intructions to determine the color for the connections.
Next will be what was confusing to me, the connection to the brake light switch, my instructions kept saying to cut and tape connections that were not there. So I used my common sense here Get your test light and look at your brake switch, it will have 2 wires ,one will be power you do not want that one. Cut the other one and connect that to the wire going to the blinker unit, this will supply power to the unit for the brake lights. Now go to the rear of you truck and find the same wire and cut it/ discounnect it. Now you should have a working system.
I have mine connected to battery power, so I have emergency flashers without the key being on.
It's not hard you just have to think a little, hpoe this helps.