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Old 02-21-2012, 15:23   #1 (permalink)
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1989 F250 Turn signals inoperative...

... but the emergency flashers work. I don't have shop manual for this, so not sure how the emergency flashers and turn signals go together, but as a normal process of elimination I recently replaced the flasher unit to a heavy duty one and all worked fine (the other one still worked BTW); thus I pulled the new/heavy duty one and replaced with original (working) one. Same issue--no worky...

All fuses look fine.

As a side note here, my son and I had the steering column off to replace ignition, but don't recall the signals/blinkers not working after completion. This F250 also has cruise control on the steering wheel and it seems to also not work. Again, the fuses all appear okay.

Me guesses it's something to do with the latter (steering column, ignition replacement), but not sure how to trace/troubleshoot the blinkers underneath the steering wheel.

Any ideas/clues folks? All would be helpful.

Jesse/WhoBuB
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Old 02-21-2012, 20:31   #2 (permalink)
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Re: 1989 F250 Turn signals inoperative...

Did you try both flashers? There's a separate one for the hazards. Here's a diagram to check it out. It may not be what you worked on that's causing it. Check fig. 27.

| Repair Guides | Wiring Diagrams | Wiring Diagrams | AutoZone.com
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Old 02-22-2012, 13:58   #3 (permalink)
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Re: 1989 F250 Turn signals inoperative...

Thanks Bert.

I'm not sure I see in the fuse block (attached actual & legends) this "other" hazards flasher. The typical/round one is clearly marked on legend as "Turn Signal Flasher"--it was this one that I had swapped out with the other, previously working flasher unit.

The location and name of the "other"/emergency flasher is a mystery to me, but the E-flashers WORK. It shows on your pointer schematic as "Hot at all times/Fuse 1/15A". That stated, the attached legend shows 'Fuse 1' as "Stop/Hazard Lamps; Speed Control". Double-checking this one at my fuse box shows that it is fine, but raises the other issue about the 'speed control' that I mentioned in original post.

So it's probably in the steering tree assembly/wiring. I don't have the schematic for that, nor did it jump out at me at the great resource you pointed to (AutoZone). My logic there is that all worked prior to the ignition replacement, but wasn't noticed as it was re-assembled. So I have the steering wheel off again and can add pics of this if it will be useful for diagnosis/clarity.

So if there is another/separate 'flasher' for the emergency flasher, that would help clarify and close that, else the #1 fuse @15 amp is THAT one.

Need to possibly double efforts on the wiring/connections under the steering wheel area. There's where I'm not sure how to troubleshoot.

Thanks again,

Jesse
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File Type: jpg 89 F250 Fuse Block + Legends.jpg (55.8 KB, 2 views)
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Old 02-22-2012, 17:45   #4 (permalink)
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Re: 1989 F250 Turn signals inoperative...

If there's power at on of the pins for the flasher with the key on then I'd say the problem could very well be in the column. You can find the hazard flasher by turning them on and listen and feel for it around the fuse box area.
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Old 02-28-2012, 16:58   #5 (permalink)
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Re: 1989 F250 Turn signals inoperative...

Sorry Bert to not get back earlier--I do NOT have power at the round flasher pin (with ignition 'on' as you stated). I'm confused (obviously) about the turn signal flasher vs. the emergency flasher--the latter SOUNDS like it is mounted behind the glove box, but can't see. I thought they were one in the same, but with the ROUND one unplugged (in fuse block with other fuses) to check for power, emergency flasher switch pulled out, emergency flashers only work, but no power at the 'turn signal flasher' unit, but there IS power on fuse #5 (for turn).

I think I need to clarify that I've posted this in the 'other' Ford forum, that of which you already know. I think it best to close this one off as Bert and other are contributing there, focusing on the wiring of the steering column and the 'turn signal switch' ("C305" as I've found). Is that best?

Thanks to those that chimed in here; the other posts can be found:

Wiring steering wheel colum for turn signals, cruise, and colum lock mechanism - Ford Truck Enthusiasts Forums

Last edited by whobub; 02-28-2012 at 17:34. Reason: clarified NO POWER to
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