Just replaced the front two winker bulbs on my 87 f250 6.9 diesel. They still don't work, where should I look next? Is there a fuse or something? Or do I need to track down wiring? Thanks in advance for your help.

 

The rear ones work? Do the front markers in the same housing work? Do the blinker lights in the dash work?

 

The rear ones do work and so do the ones in the dash.

 

How about the running lights in the same housing as the front turns. If the running lights work, looks like it might be a problem with the switch in the column(turnsignal switch). If the running lights do not work, you might need to check the grounding to the front lights.

P.S. You might also want to grab your emergency flasher switch and run it up and down rapidly about 10 times and then see if that changes anything.

 

So, it's been a while. I finally got around to replacing the turn signal switch, flasher and all bulls. Rear turn signals were out for a bit until I replaced the flasher. Anywho, I still have no front turn signals or anything other than head lights up front. Is there a common issue on the grounding of these things? Anywhere I should start looking first? Thanks in advance for any help.

 

I would go get a testlight like the one below. I would twist the sockets out of the housings, and then poke the wires with the testlight to see if you have power on the wires. Clip your ground lead of the testlight to the battery negative terminal and then with the headlight switch pulled out so the marker lights come on, poke the dark brown wire on both sides. The darkbrown is the running light circuit. Your testlight should light up if you have power.

 

ahh. Thank you. I assume I could do the same with a multimeter? Now I know which wires to prod though.

 

You could use a multi-meter. Just make sure you have the bulb plugged in when checking with a meter. If you decide to pull the bulb and probe the socket with a meter, you can get false readings. That is when a testlight is better. The multi-meter will work fine though if you keep the bulb plugged in to keep a load on the circuit. And the multi-meter usually doesn't have a very sharp point on the probe like the testlight, so it may be more difficult to poke through the insulation of the wire.

On the front sockets, the running lights are one circuit, you will find the same dark brown wire on both sides and also for the fender marker lights The different color wires on both sides are the turn wires.

 

Update. Just needed new winner sockets. There is a thin piece of metal that rusted off. Probably common on the coast.

 

*winker sockets