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Author Topic: LED Tail light bulbs  (Read 142 times)

blueamber

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LED Tail light bulbs
« on: November 26, 2018, 09:07:18 PM »

Just repaired all 6 of my 94xr2 lenses, tried researching the best LED bulb to replace the incandescent 1157.  Wanted to make sure the difference between tail light on and brake light on was definite.  I tried several, settled on the LED Sylvania 1157R.  Its red, seems redundant, but works really well... and no more melting...
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blueamber

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Re: LED Tail light bulbs
« Reply #1 on: November 27, 2018, 11:59:39 AM »

Crap!  Just discovered putting the LED bulbs in made my cruise control stop working!  Seems the cruise circuit relies on a ground through the filaments of the stop bulbs to work.  That is missing with the LEDs, which have electronics internal.  Maybe I can run a big resistor to ground in the circuit to fix it....

Again, this is for 1994 cars, the cruise system is different than for 91 to 93, don't know if LEDs will screw it up or not.
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greywolf27030

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    • 88 Festiva, 91 Capri, 91 XR2
Re: LED Tail light bulbs
« Reply #2 on: November 27, 2018, 03:11:00 PM »

Thanks, come spring I've got to work on my cruise also.

Jack Byrd
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Skunkwrkz

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    • 84' Porsche 928, 88' RX7 V8, 95 M3, 02 Celica GTS
Re: LED Tail light bulbs
« Reply #3 on: November 27, 2018, 03:26:12 PM »

Couldn't you just make redundant harnesses (that can be packaged and hidden) for the regular stop bulbs for the time being? So that the cruise thinks they are there? Couple pig tail harnesses and some vampire connectors later.  8)
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blueamber

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Re: LED Tail light bulbs
« Reply #4 on: November 27, 2018, 10:44:55 PM »

Solved it by crimping 50 ohm resistor between ground and hot wire to the stop part of one of the 1157 bulbs.  Fools cruise into thinking there is a filament to ground.  So I guess cruise stops working if both your 94 stop lights burn out...
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Skunkwrkz

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    • 84' Porsche 928, 88' RX7 V8, 95 M3, 02 Celica GTS
Re: LED Tail light bulbs
« Reply #5 on: November 27, 2018, 11:01:56 PM »

Nice. Sounds like a cheap fix and probably a better long term solution.
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jdp

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    • 1994 Magenta Capri NA, 94 Reef greenXR2 and 92 XR2
Re: LED Tail light bulbs
« Reply #6 on: November 28, 2018, 12:12:37 PM »

Blueamber.....thanks for the update.  Also, is it correct that you only had to put the resistor on one bulb position? 

thanks....John
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John

blueamber

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Re: LED Tail light bulbs
« Reply #7 on: November 29, 2018, 10:00:09 PM »

One resistor... the stop bulbs run off the same wire so one resistor works... this problem may be only with the 94 xr2... the third stop light on the trunk is LED which is why replacing the 2 1157s removed the ground through the filaments... if the 3rd light for non xr2 94's is incandescent (is that true?) then just replacing the 1157s should not affect the cruise...
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jdp

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  • Posts: 87
    • 1994 Magenta Capri NA, 94 Reef greenXR2 and 92 XR2
Re: LED Tail light bulbs
« Reply #8 on: November 29, 2018, 10:15:57 PM »

Thanks Blueamber.....When I get a few minutes this weekend, I will see if I check on a non-94 third light.

John
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John