LED Tail Lights

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Nov 8, 2018 | 03:47 PM

#16

Colorado350

Postmaster

Joined: Nov 2015

Posts: 4,807

Likes: 125

From: Colorado Springs

Quote:

Originally Posted by Hussler

On the OBS (94.5 - 97 year models) this was a problem. LED's without the resistor did cause the torque converter to unlock as if you were stepping on the brake peddle. PCM supplied a small voltage to the brake lights always and think with the resistance of the 3 brake lights it was around 3 volts. If one or more lights burnt our that voltage would go up to 5.0 volts causing the TC to unlock, thinking you hit the brakes. I don't have a clue why Ford made this design, On the OBS forum many have reported with key on and lights off the brake lights were on at visible (led) very dim,.

There was a technical bulletin on this issue but can't find it. In any case Ford probably fixed the issue on the 99 - 93

Jim, THANKS for clearing that up. I knew I wasn’t making it up.

Nov 8, 2018 | 04:01 PM

#17

F250_

Hotshot

Joined: Nov 2006

Posts: 11,288

Likes: 269

From: North of Greenville

Facts are a good thing! Thanks, Jim.

Nov 9, 2018 | 11:58 AM

#18

Shovelheadrob

Fleet Mechanic

Joined: Nov 2009

Posts: 1,383

Likes: 193

From: Cambs, England

Quote:

Originally Posted by F250_

I believe the "interference" is when there is no resistor built into the light kit and the result is a really fast blinking turn signal as if you have a burned out bulb. The built in resistor creates the proper resistance in the light circuit so that your turn signal blinks at the proper rate. If there is truly some other interference with other truck systems, I want to know about it as well because I've also been looking at some rear LED kits.

My personal favorite is linked here...

https://www.carid.com/2005-ford-f-25...659511411.html

They looklike the same lights that I have (but the smoke version) the fit is close to factory & I'm very happy with them. I changed the front bulbs to switchback led's too.