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Old 12-17-2013, 05:54 PM
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LED bulbs

so havent been able to find a clear answer ive read hundreds of times that u cant use led bulbs in our trucks some say is just with the tail lights some say its the entire truck without a resistor i know the tail lights is true but what about the rest of the truck
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Old 12-17-2013, 06:00 PM
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As long as the bulb isn't a "flasher" (turn signal, etc) you can use LED bulbs without modifications.
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Old 12-17-2013, 08:21 PM
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so a led third brake light and bed lights wouldnt work without a resistor since the third brake light is a flasher?
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Old 12-17-2013, 08:51 PM
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The reason resistors are needed is that the flasher unit is based on a load of the circuit. LEDs have a lower load, so you get a fast flash conditions when using the turn signals.

The TBL is not a flasher, it is a brake light. The brake lights will work fine. The bed lights will work. This is a turn-signal issue.

You also may want to check at the auto parts store to see if there is an electronic flasher that will fit your truck. There is for Super Dutys, I have one in my truck.
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Old 12-18-2013, 05:39 AM
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Alright cool thanks guys just wanted that cleared up
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Old 12-18-2013, 02:08 PM
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If a resistor is not done for the brake lights the Trans WILL act up if it's auto, if stick it won't matter
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Old 12-19-2013, 08:22 AM
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Quote:
Originally Posted by 351fifty View Post
If a resistor is not done for the brake lights the Trans WILL act up if it's auto, if stick it won't matter
I dont have any problems Kris?? And im pretty sure neither does Matt?
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Old 12-19-2013, 09:09 AM
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My brake lights have resistors built into them....and I have an electronic flasher unit
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Old 12-19-2013, 09:12 AM
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Quote:
Originally Posted by BigFuel View Post
My brake lights have resistors built into them....and I have an electronic flasher unit
Well shoot that might be why Maybe ill swap some regular bulbs back in and see if my trans acts any different but i really didnt notice any change after i did it but i have developed a grind at high rpms but idk maybe its a u joint.
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Old 12-19-2013, 09:19 AM
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Naw, bulbs won't do that. The turn signal system is using the same high side filament as the brake system to light the bulb. Since the LEDs, as perfectly stated before, do not eat all the appropriate energy that is supplied buy the turning system the unused energy back feeds through the TBL and back to the switched side of the BOO switch. The PCM seeing this loose energy then thinks that the BOO switch was activated and kicks the trans out of overdrive. Nothing like hauling horses over a hill and go to change lanes to have the trans start bucking in and out of overdrive in time with the turn signal switch.

Last edited by BigFuel; 12-19-2013 at 09:22 AM.
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