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Thread: 94 GT Conversion to LED bulbs

  1. #1
    Smokin 1500HP - Member ToplessPony94's Avatar
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    94 GT Conversion to LED bulbs

    Explore Kenny Brown Performance today!!
    I recently did a complete replacement of all exterior bulbs with LEDs on my 94 GT vert. I'm very, very pleased with the results. I'll detail the information below on sources and part numbers.

    First, I chose to replace the flasher with one that doesn't depend on bulb load to flash correctly. This eliminated the need to add load resistors to everything that flashes to eliminate "hyperflashing" like you get when one bulb dies. The load resistors are big, they get very hot and they must be mounted to metal and away from anything that doesn't like getting hot. They are a pain, and adding up the ones needed, they cost more than replacing the flasher, too. Also, without the load resistors the LED bulbs will draw much less power than the incandescent bulbs, leaving a bit more juice for everything else.

    I did also replace the map light bulbs in the mirror. Those of you with hardtops will have a dome light, which takes the same bulbs. I did not replace the third brake light bulbs because I had already replaced that with an LED based unit years ago. I don't use my fog lights with the HID conversion I have, so I don't even run bulbs in those, just a blackout cover. I also did not replace any dash bulbs, mostly because I had installed Indiglo dash and climate panels years ago. Though it's probably time after 19 years to replace those warning bulbs... something for me to think about.

    One important note here: If you are putting an LED bulb behind a colored lens you MUST use an LED bulb of the same color as the lens: Red behind a red lens, amber behind an amber lens. There reason for this: The colored lens will absorb most of the light from the bulb that is not the color of the lens, so it's much more useful to get a bulb that produces most of its light in the part of the spectrum that will actually get through the lens (duh!). The appearance will be dim and washed out if you don't follow this advice.

    Since I run a clear lens on my front turn signal area, I chose the Raxiom SwitchBack bulbs for that location. This is VERY cool! When the parking lights are on this bulb shows white. When just the turn signal or flasher is on this bulb flashes amber. When the parking lights and turn signal or flasher is on, this bulb switches colors (white - amber - white - amber). You have to see it to appreciate how cool this is, and it's BRIGHT!

    Here are the products I used:



    # I didn't try this because it isn't a sealed bulb and I was nervous about putting it out at the plate
    & DO NOT use this bulb - not very bright - use the SuperBrightLEDs 3156-CW3W-G bulb instead

    (Thanks to Jay (Xerxeese) and Bob C. for their able assistance and encouragement during the project.)
    Last edited by ToplessPony94; 01-17-2014 at 05:58 PM. Reason: Add underhood and trunk bulbs
    Bruce (aka: "Stealth Fighter Pilot")
    TFS TW heads, rockers, 75mm intake, cam, 75mm TB, CAI, MAF, DeatschWerks 35# injectors, Aeromotive rails/regulator, 255 pump, BeCool radiator, alum water pump, MSD 6A/coil,alum flywheel, PP, driveshaft, McLeod clutch, Torsen T2R, 3.73, 31spline axles, 17" 95 Cobra R, NT-05 255/275, MM CC plates, coil-over (Bilstein), rlca, K-brace, A-arms, bumpsteer, SF conns, Cobra brakes, =len shorties, 2.5" SS Hpipe, Borla CB, all LED lights

  2. #2
    Smokin 1500HP - Member ToplessPony94's Avatar
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    Realized I forgot to indicate underhood and trunk bulbs. Corrected in original post.
    Bruce (aka: "Stealth Fighter Pilot")
    TFS TW heads, rockers, 75mm intake, cam, 75mm TB, CAI, MAF, DeatschWerks 35# injectors, Aeromotive rails/regulator, 255 pump, BeCool radiator, alum water pump, MSD 6A/coil,alum flywheel, PP, driveshaft, McLeod clutch, Torsen T2R, 3.73, 31spline axles, 17" 95 Cobra R, NT-05 255/275, MM CC plates, coil-over (Bilstein), rlca, K-brace, A-arms, bumpsteer, SF conns, Cobra brakes, =len shorties, 2.5" SS Hpipe, Borla CB, all LED lights

  3. #3
    Nice write up, where were you when I did this back in Nov 2013, it would of helped. I like the following for LED bulbs
    * http://www.superbrightleds.com/
    * http://www.diodedynamics.com/store/

    Superbright for gauge cluster bulbs and Diode Dynamics for exterior bulbs. I tried the ebay LEDs and you can clearly see the difference in the more expensive LEDs and the ebay stuff didn't last as long. I didn't see any issue with the license plate LEDs, and so far they've worked great.

    Randy,
    Now I did have some issues with LED tail lights, I have sequential tail lights and they blinked way to fast with load resistors and different flashers so I removed them. Do you have sequential tail lights?
    1994 Yellow Mustang GT

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  4. #4
    Smokin 1500HP - Member ToplessPony94's Avatar
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    Quote Originally Posted by Michael Plummer View Post
    Nice write up, where were you when I did this back in Nov 2013, it would of helped. I like the following for LED bulbs
    * http://www.superbrightleds.com/
    * http://www.diodedynamics.com/store/

    Superbright for gauge cluster bulbs and Diode Dynamics for exterior bulbs. I tried the ebay LEDs and you can clearly see the difference in the more expensive LEDs and the ebay stuff didn't last as long. I didn't see any issue with the license plate LEDs, and so far they've worked great.

    Randy,
    Now I did have some issues with LED tail lights, I have sequential tail lights and they blinked way to fast with load resistors and different flashers so I removed them. Do you have sequential tail lights?
    Sorry Michael, I was in the research phase in November. Didn't do the actual work until December/January.

    Thanks for the comment and diodedynamics link. If you haven't tried the SwitchBack bulbs, they're really nice! Pricey though!
    Bruce (aka: "Stealth Fighter Pilot")
    TFS TW heads, rockers, 75mm intake, cam, 75mm TB, CAI, MAF, DeatschWerks 35# injectors, Aeromotive rails/regulator, 255 pump, BeCool radiator, alum water pump, MSD 6A/coil,alum flywheel, PP, driveshaft, McLeod clutch, Torsen T2R, 3.73, 31spline axles, 17" 95 Cobra R, NT-05 255/275, MM CC plates, coil-over (Bilstein), rlca, K-brace, A-arms, bumpsteer, SF conns, Cobra brakes, =len shorties, 2.5" SS Hpipe, Borla CB, all LED lights

  5. #5
    Quote Originally Posted by ToplessPony94 View Post
    Thanks for the comment and diodedynamics link. If you haven't tried the SwitchBack bulbs, they're really nice! Pricey though!
    I have a friend that bought those switchbacks bulbs and you're correct, they're pricey but I didn't like them as much as I thought I would so I'm still on the fence.
    1994 Yellow Mustang GT

    839rwhp and 770rwtq SAE

    Proud Member of:
    SmokinStangs.com-- www.smokinstangs.com

  6. #6
    Founding Member SmokinStang's Avatar
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    Bruce...Very nice!! Thank you for taking the time to share & document!!

    As a 94 owner, I'm looking forward to seeing these 1st hand in action!!
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  7. #7
    Smokin 300HP - Member Xerxeese's Avatar
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    I had fun assisting in the installation !


    2003 Pony Edition V6 auto. Mostly stock (for now!)

    Jay

  8. #8
    Oops, sorry Bruce I called you Randy.
    1994 Yellow Mustang GT

    839rwhp and 770rwtq SAE

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  9. #9
    Smokin 1500HP - Member ToplessPony94's Avatar
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    Quote Originally Posted by Michael Plummer View Post
    Oops, sorry Bruce I called you Randy.
    Ah! Since the question was really for me, no I don't have sequential tails. Your kit has the sequential electronics as part of the kit, so I would think that would need to be replaced, not just the main flasher. It's probably load sensitive. But did you try replacing the main flasher instead of going with load resistors? Maybe it would work with a load resistor on each bulb in the tail? I have extras if you want to try it.
    Bruce (aka: "Stealth Fighter Pilot")
    TFS TW heads, rockers, 75mm intake, cam, 75mm TB, CAI, MAF, DeatschWerks 35# injectors, Aeromotive rails/regulator, 255 pump, BeCool radiator, alum water pump, MSD 6A/coil,alum flywheel, PP, driveshaft, McLeod clutch, Torsen T2R, 3.73, 31spline axles, 17" 95 Cobra R, NT-05 255/275, MM CC plates, coil-over (Bilstein), rlca, K-brace, A-arms, bumpsteer, SF conns, Cobra brakes, =len shorties, 2.5" SS Hpipe, Borla CB, all LED lights

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