LED tail light problem
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Stage II
Joined: Apr 2019
Posts: 2
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From: Benton
LED tail light problem
01 fxdl I just installed an LED tail light and I connect ground, then running light and it's fine but when I connect brake wire the light dims down and when I hit the brake it only brightens up to what the regular running light is. If I disconnect running wire and connect brake on blue connection it's bright as hell so I know the it's supposed to work right. I'm stumped. Please help!! Thanks in advance
Seasoned HDF Member
Joined: Aug 2008
Posts: 5,064
Likes: 1,003
there are a couple of ways these are made.
on the simple style, there are two separate circuits, one for the running light and uses either a lower lumen led or a dropping resistor. on the brake side, the leds are high output.
now they have some with a chip that controls the functions. you have a single circuit and when the chip is only receiving the running input, applies a set level of current. when the brake input is seen by the chip, it supplies high output current to make the leds bright but could take away from the running. it is really hard to say. it could be a source issue, bad controller if it has one. what brand??
on the simple style, there are two separate circuits, one for the running light and uses either a lower lumen led or a dropping resistor. on the brake side, the leds are high output.
now they have some with a chip that controls the functions. you have a single circuit and when the chip is only receiving the running input, applies a set level of current. when the brake input is seen by the chip, it supplies high output current to make the leds bright but could take away from the running. it is really hard to say. it could be a source issue, bad controller if it has one. what brand??
Stellar HDF Member
Joined: Apr 2016
Posts: 3,316
Likes: 2,111
From: Masshole
Put the leads right to the battery, 1st with run lead then with both the run and stop lead. Does it do the same thing? If so, it's the light, if not, then further troubleshooting is needed.
Stellar HDF Member
Joined: Feb 2015
Posts: 3,415
Likes: 1,122
From: USA
that may be the tail light itself, I did a Kuryakyn on my 04 FXDI that I bought here in the classifieds, it was a plug and play, no issues, and I had the HD R/T/B module. Wish I could say i'm not having a problem with my current set up on my 05 FLSTCI
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