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New install sequential tail lights - flashing hyper fast - help?

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New install sequential tail lights - flashing hyper fast - help?

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Old 11-06-2018, 09:37 PM
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Austin1073
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Default New install sequential tail lights - flashing hyper fast - help?

Hey everyone, just installed some new sequential led tail lights and led Halo headlights. They look great but after I installed the passenger tail light and tested it all the blinkers went into lightspeed mode. Just like when you have a bulb out on one side except its on both sides. Anyone have any idea why they're doing that? I tried backing it up and took the passenger tailight out again but no change to the driver side, checked all the connections. Any help would be appreciated
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Old 11-07-2018, 04:53 PM
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08'MustangDude
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SO, the left one, tested first, blinked normal. Then, when you put the passenger side in,
they ALL hyper-flash? Now, even after taking out the passenger side, the driver side
hyper flashes?

My just be a coincidence, I had a car once, where it would blink normal 2-3 times, then
hyper-flash. Then, it hyper-flashed all the time. You may just need an LED flasher.

LEDs use less current, so it thinks the bulb(s) are out. We just install LED flashers
instead of load resisters.

BEST TEST, put the originals back in, and test. If they flash normal, then you know
it is the tails or the current issue. Remove the bulb sockets, all of them, and just
use a dangling harness with the bulbs plugged in. This way, you wont have to keep
installing and uninstalling the whole assembly, just plugging in a harness with the
incandescent bulbs in it for testing.
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Old 11-07-2018, 05:01 PM
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Austin1073
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Originally Posted by 08'MustangDude View Post
SO, the left one, tested first, blinked normal. Then, when you put the passenger side in,
they ALL hyper-flash? Now, even after taking out the passenger side, the driver side
hyper flashes?

My just be a coincidence, I had a car once, where it would blink normal 2-3 times, then
hyper-flash. Then, it hyper-flashed all the time. You may just need an LED flasher.

LEDs use less current, so it thinks the bulb(s) are out. We just install LED flashers
instead of load resisters.

BEST TEST, put the originals back in, and test. If they flash normal, then you know
it is the tails or the current issue. Remove the bulb sockets, all of them, and just
use a dangling harness with the bulbs plugged in. This way, you wont have to keep
installing and uninstalling the whole assembly, just plugging in a harness with the
incandescent bulbs in it for testing.
Yes thats right. I was testing all the lights as I went and didn't have any trouble with them until I got to the passenger side tail light, once I got to that one they started hyper-flashing. Appreciate the advice. Ill give that a shot tonight. When you say led flashers are you talking about the blinker Relay?
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Old 11-07-2018, 06:04 PM
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08'MustangDude
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Yes, LED blinker relay.

Newer cars don't have them, the clicking sound you hear is a speaker, and the
BCM controls the lighting.
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Old 11-07-2018, 06:25 PM
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pure_kaos
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Old 11-07-2018, 07:44 PM
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08'MustangDude
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Look elsewhere, no way would I pay $30.00 for a relay... eBay...
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Old 11-08-2018, 04:07 PM
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Z28KLR
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Autozone etc has them for $15. I can try to get you a brand name and part number later if you need it. The relay itself is located up near the OBD2 port, just look/feel around for it.
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