Turn Signal Causing Causing Trannie Problems - Ford Powerstroke Diesel Forum
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Old 08-14-2010, 10:33 AM
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Turn Signal Causing Causing Trannie Problems

IDK what is going on with my old truck. It is a 97 F350 CC long bed dually 2 wheel drive with an automatic trans. It only has 80,000 on it.

I first noticed the problem on long trips, i would set my cruise, and when i use my turn signal to change lanes it would kick the cruise off.

Now it almost seems that it is kicking the tranny out of overdrive when I use the turn signal.

Any Ideas what may be causing this.

Thanks
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Old 08-14-2010, 10:44 AM
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Could be a bad turn signal switch. Caused some strange issues on my old truck. But they were all light related.
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Old 08-14-2010, 10:56 AM
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Sounds like a bad bulb or ground connection in the tail lights. Kicking out the cruise control sounds like it would be brake light related, but I am not sure about the overdrive. Check to see if all the lights are doing what they are supposed to at the back of the truck. Do you have a towing package? There might be some bad connections in there too.

I think Dereku is on the right track though. I dont think you can dissasemble the turn signal switch to test it, and when I replaced mine new, it was $80.
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Old 08-14-2010, 11:08 AM
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lights work as they should, and yes it has a towing package.
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Old 08-14-2010, 11:26 AM
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Interested to know this also.My 97 does this too when using right signal and mine is a stick.
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Old 08-14-2010, 11:51 AM
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this is kinda off topic but it could be a lot worse. on my friends dodge every time you hit the left turn signal the wipers come on. and every time you hit the horn they come on to
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Old 08-14-2010, 12:00 PM
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Yeh I forgot about the towing package. Mine melted together on the 96 and cause all the brake warning lights to come on. Took me a few days to realize that it was the wiring and not a serious ABS problem.

Local trailer place fixed it for about 200
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Old 12-01-2010, 10:21 AM
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I have the same problem mine it is a 96 f250 and it drops out of overdrive when i turn the right signal on, so im wondering if you were able to fix the problem.

Thanks
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Old 12-01-2010, 01:13 PM
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Most common cause is the cab-roof center stop light being burnt out, or removed. But the brake lights on the bed-sides, or any issue with the trailer light wiring (if applicable) can do it as well.
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Old 12-01-2010, 01:15 PM
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Quote:
Originally Posted by 2000 7.3 6speed View Post
this is kinda off topic but it could be a lot worse. on my friends dodge every time you hit the left turn signal the wipers come on. and every time you hit the horn they come on to
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