Transmission issue?
Thread Starter
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Junior User
Joined: May 2017
Posts: 62
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so went to use the cruise control today coming home from work and it's not working. That have anything to do with the converter?
Elder User
Joined: Dec 2005
Posts: 776
Likes: 3
From: Felton, Delaware
Yes, because you installed LED lights and have no 3rd brake light. You're getting stray voltage through the 3rd brake light wire that tells the computer to unlock the converter and also cancel the cruise control. I know on my truck, 3rd brake light was out and with the lights off at night you could very faintly see my LED brake lights still lit on the tow truck body. That's how i knew i had stray voltage on the brake wire. I dont know why i had it but it caused converter issues and i know when i replaced the blown 3rd brake light it went away. It's been fine for 15,000 miles now. So i would try putting a working non LED bulb in your 3rd brake light. Cruise not working and converter not locking usually means your brake signal is telling the truck its stopping
Thread Starter
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Junior User
Joined: May 2017
Posts: 62
Likes: 0
Yes, because you installed LED lights and have no 3rd brake light. You're getting stray voltage through the 3rd brake light wire that tells the computer to unlock the converter and also cancel the cruise control. I know on my truck, 3rd brake light was out and with the lights off at night you could very faintly see my LED brake lights still lit on the tow truck body. That's how i knew i had stray voltage on the brake wire. I dont know why i had it but it caused converter issues and i know when i replaced the blown 3rd brake light it went away. It's been fine for 15,000 miles now. So i would try putting a working non LED bulb in your 3rd brake light. Cruise not working and converter not locking usually means your brake signal is telling the truck its stopping
Thread Starter
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Junior User
Joined: May 2017
Posts: 62
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well I put new bulbs in and I think I may have fixed it can't really tell on the streets and it's rush hour traffic right now so maybe later I hit the highway and see how it does. Thanks agian!
Thread Starter
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Junior User
Joined: May 2017
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indeed thanks for the tips 👌🏼
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Freshman User
Joined: May 2016
Posts: 26
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From: Leaburg, OR
I've been monitoring this thread and ma having siminlar problems with my '03 SD and a flshing OD light. Wow! All that because of a light bulb! I'll check my rig in a few minutes.
I'm hoping (praying!) that's my problem too!
I'm hoping (praying!) that's my problem too!
Elder User
Joined: Dec 2005
Posts: 776
Likes: 3
From: Felton, Delaware
i think the 3rd brake light converter unlock is only in obs trucks
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,738
Likes: 2,667
From: SE Florida
That problem was corrected in the '99 and newer trucks.The flashing OD light means codes have been stored that will direct the diagnosis. You MUST get those codes to get this fixed. The places that read codes free CANNOT read these codes. You need either a good independent shop or a Ford dealer.
Freshman User
Joined: May 2016
Posts: 26
Likes: 0
From: Leaburg, OR
The flashing OD light means codes have been stored that will direct the diagnosis. You MUST get those codes to get this fixed. The places that read codes free CANNOT read these codes. You need either a good independent shop or a Ford dealer.
Freshman User
Joined: May 2016
Posts: 26
Likes: 0
From: Leaburg, OR
Following up on previous post, I changed the tranny and torque converter oil...thoroughly...I flushed the assembly with gallons of good stuff and the tranny seems to be a happy camper. I drove the rig about 110 miles (mixed highway and surface streets) without any overdrive warning light flashing at me. The tranny works perfectly. Could this have done the trick? I will keep a close eye of course.
The old fluid was "tannish" colored so I decided to just put good stuff in there.
The old fluid was "tannish" colored so I decided to just put good stuff in there.
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