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Reverse lights and turn signals ran away

 
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Old 08-27-2009, 08:26 PM
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Reverse lights and turn signals ran away

Tonight I lost my reverse lights and turn signals on my 88 f150 4.9 manual transmission. They worked fine 2 days ago and the fuse is fine but the flasher isn't clicking with the blinker on. Would that be the problem? The turn signals and reverse lights are on the same fuse.
 
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Old 08-27-2009, 09:11 PM
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If your blower fan also is not working, most likely the ignition switch contact that feeds both fuse #5 and fuse #9 is bad. Should measure 12 volts at both fuses when the key is in the On/Run position.



 
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Old 08-27-2009, 09:37 PM
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thanks very much
 
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Old 08-28-2009, 08:51 AM
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The blower fan is fine. Now what?
 
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Old 08-28-2009, 10:58 AM
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1) Do the 4 way flashers work? If they do that indicates the wiring to the rear turn signal bulb circuit is good.

2) What happens when you turn the turn signal lever to left or right with the ignition on? Does each rear turn signal lamp light and not blink? That would indicate a bad turn signal flasher.

3) Pull out the flasher which is plugged into the fuse box and see if the Reverse lights work.

4) Are you using a ohm meter to verify the fuse is not blown or just looking at it? Did you replace the 15 amp fuse?
 
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Old 08-28-2009, 04:57 PM
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the problem is something with the ignition. they don't work when I turn the truck on but if i wiggle the ignition around a little (turning the key forward and back just a little) they will start working. what do I need to change, clean, or check?
 
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Old 08-28-2009, 05:07 PM
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If you turn the ignition key to the Accessories position and it works and the Start position works, I'd replace the ignition switch.

It's bolted to the top/middle of the steering column. As you can see the two mounting holes are slotted so the ignition switch can be adjusted. If no one has messed with the ignition switch and the two mounting nuts are not loose I'd say the contacts that provide 12 volts to the two fuses in the schematic are bad.

When you turn the ignition key it moves a rod that moves the ignition switch to the different positions.
 
 
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