New Turn Signal Switch

[QSA United]

So I drove an hour and a half to Truck and Car Shop (City of Orange) here in Southern California to purchase a new turn signal switch for my '71 F-100. I got the part and drove an hour and a half back to my home. Once I got home and did the whole process of removing the steering wheel and turn signal switch, I noticed that my original switch has seven wires (D0TZ-13341B) and the one I got (C5OZ-13341-B) has eight wires. How can I use this switch in my truck, without having to go back and spend an extra 3 hours back and forth for the correct one? Does anyone have the colour codes for the new switch (8 wires) and the colour codes for the original switch (7 wires)? I'm quite sure I can still use it, I just can't seem to find the codes for the new switch.
Thanks, Angel.

[sargentrs]

C5OZ-13341-B is for a '63-'64 Falcon/Fairlane. Here's a diagram (2 pcs) for those. Shows 8 wires. Maybe you can trace it and figyre it out? http://www.oldcarmanualproject.com/tOCM ... 65-222.jpg
http://www.oldcarmanualproject.com/tOCM ... 65-223.jpg
Since the turn signal switches changed for '70-'72, the '72 diagram connections should work for your '71.
http://www.fordification.com/tech/wirin ... _quick.jpg

[QSA United]

I'll give it a shot, currently I'm stuck at work and I'm going through five wiring diagrams/schematics. I won't be home until 22:15 hrs.
Thanks again, Angel.

[QSA United]

Tried it and no luck. I went through the schematics from '66 to '69, and those from '70 to '72. I also used the schematic from a '66 Mustang, since the turn signal switch was used on it as well. Looks like I have it figured out on the wire colours and functions. Time to test it out and see if it works, hopefully!

[QSA United]

Still no luck. I'm connecting the wires to the spot in which they belong yet they don't function. Emergency lights don't flash at all, [already replaced the flashers (for LED's) and lights to LED bulbs] yet they don't flash. Left turn signal stays on, right turn signal flashes only once. Brake lights turn on when I press the brake pedal down, but for some reason the lights inside (turn signal indicators on the cluster) turn when I press the brake pedal (while the emergency switch is pulled). Any help?

[sargentrs]

If it was me, I'd forget about matching wire and colors and start diagnosing 1 circuit at a time by hooking up power and disconnecting all the other wires, possibly removing them from the plug and using jumper wires one socket at a time. This diagram shows a lot more detail although quite a bit more technical http://www.fordification.com/tech/wirin ... ing_06.jpg Looks like the red/black wire comes in from the brake light switch into the harness plug as the source of power. The '72 diagram shows 2 wires going into the same socket on the plug. One from the brake light switch and one from the emergency flasher switch. I would hook up the source power and then check each other pin one at time checking for function. With the red/black wire connected, the brake lights and emergency flashers should work. You'll have to connect at least 1 of the turn signal bulbs for test. I'd check one, then connect the opposite side, then the opposite corner, etc. If not, then check those circuits for power in/power out. And so on, and so forth.

Either that or send it back and order another. Dennis Carpenter lists the D0TZ-13341-B as fitting 1969-1972 although I believe the break point was '67-69 and then '70-'72. http://dennis-carpenter.com/turn-signal ... Z-13341-B/ I do trust them more than any of the other vendors though.

[QSA United]

Okay, so I did it all using the diagrams you linked me and a circuit tester. Power goes out to all four corners. Only they don't flash still, and the lights (turn signals on the dash) also go on when I step on the brakes. I already replaced the headlight switch as well. Should I replace the emergency lights switch as well?

[sargentrs]

Wouldn't hurt. Can you go back to regular bulbs and flashers instead of the LED's? I like to take things back to stock when diagnosing.

[QSA United]

I'll have to buy those bulbs again, as I have tossed them out. The turn signals worked fine but I wanted a new switch for her since well, it was the original switch.

[sargentrs]

From looking at the diagram it appears the hazard switch is the only circuit that shares connections with the brake light switch and the turn signal indicators on the dash. Replace that. Bad grounds can also cause strange problems. There are connectors for both front and rear light harnesses. Start by unplugging the light circuits at the front and rear and see if the dash lights come on when you press the brakes. If they don't you know the problem is mostly a bad ground in those circuits. Then plug them back up one at a time and see when it begins to happen.

[QSA United]

So, I replaced the emergency lights switch, same issue. If I turn on the left turn signal, it stays on (steady). If I turn the on right turn signal, it stays on (steady). When I turn on the emergency lights, they stay on (steady), and on when I press the brake switch, the lights inside (instrument cluster turn indicators get brighter). I still have the same problem.

[sargentrs]

Well, that's progress. At least you know you have power going to all the appropriate places. Now just need to get them to flash. Did you take everything back to the original filament bulbs and flashers? Seems like the issue may now be related to the turn signal flasher. There's a 2 prong connector that comes from that flasher (you know you have 2 right? One for the hazard lights and one for the turn signals.) and the wires go to the turn signal switch (blue) and to the instrumental panel circuit board (Orange/Yellow). Have you replaced that one and made sure the connections are good? Have you checked and cleaned all the grounds out at all four corner lights?

[QSA United]

I do know there are two flashers, both of which were replaced with LED flashers and LED bulbs. I have not cleaned the ground yet, I'll do that and replace the bulbs back to regular incandescent bulbs. If they flash after the ground is cleaned up, I'll go ahead and put the LED bulbs again and recheck them.

[sargentrs]

Sounds like a plan!

[QSA United]

After a few months, I finally got a chance to work on the truck. I got the correct turn signal switch now, I also replaced my emergency switch as well as my headlight switch. However, the problem still remains. When I pull the lever down (to turn left) it doesn't turn on. When I push the lever up (to turn right), it doesn't turn on. When I pull the emergency light switch out, they don't turn on. But when I step on the brake while the emergency light is out, they turn on. Any ideas now? Keep in mind that I do have the LED flashers.