Turn Signal Causing Causing Trannie Problems - Ford Powerstroke Diesel Forum
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post #1 of 12 Old 08-14-2010, 09:33 AM Thread Starter
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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.

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post #2 of 12 Old 08-14-2010, 09:44 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.

2002 f250 BFT Edition


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post #3 of 12 Old 08-14-2010, 09:56 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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post #4 of 12 Old 08-14-2010, 10:08 AM Thread Starter
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lights work as they should, and yes it has a towing package.
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post #5 of 12 Old 08-14-2010, 10:26 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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post #6 of 12 Old 08-14-2010, 10:51 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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post #7 of 12 Old 08-14-2010, 11:00 AM
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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

2002 f250 BFT Edition


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post #8 of 12 Old 12-01-2010, 09:21 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.

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post #9 of 12 Old 12-01-2010, 12:13 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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post #10 of 12 Old 12-01-2010, 12:15 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

What this nation needs is cleaner thoughts and dirtier fingernails...
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