Fat Bob Brake Light stuck on
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Stage III
Joined: Jul 2024
Posts: 3
Likes: 0
From: Idaho
Fat Bob Brake Light stuck on
I have a '17 Dyna Fat Bob FXDF that has has issues with the brake light sticking on. At first, it was from the front brake master cylinder plunger not pushing the brake lever back out all the way to shut the brake light off. a few jiggles of the brake lever and the light would go off. Now its stuck on and I don't think its due to the front brake switch anymore. The bikes DIAG code is b2223 (Rear brake switch shorted low (light on)) and gave me the Pn 41000351A (BCM). I took the BCM out and off to visually inspect what i could to make sure there wasnt any corosion on any of the wires. BCM wires and plugs look fine. Plugged BCM back in and now the hazards come on and they wint shut off from the hazard switch. They only shut off if i disconnect the BCM. Did I do something wrong by disconnecting the BCM? Or is is a short in the wiring harness? HELP!
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Stage III
Joined: Jul 2024
Posts: 3
Likes: 0
From: Idaho
Just did and when I turned the Ignition on, the brake light was off. When I plugged it back in, the brake light came on again. Does that point to a faulty rear brake switch? Don't mean to ask simple questions, I am just not very mechanically inclined when it comes to motorcycles and electrical stuff.
Just did and when I turned the Ignition on, the brake light was off. When I plugged it back in, the brake light came on again. Does that point to a faulty rear brake switch? Don't mean to ask simple questions, I am just not very mechanically inclined when it comes to motorcycles and electrical stuff.
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Stage III
Joined: Jul 2024
Posts: 3
Likes: 0
From: Idaho
Thanks for the info. Like I said, I am new to working on motorcycles and wasnt sure if it meant a more extensive electrical problem.
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HDF Community Team
Joined: Aug 2018
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From: New Hampsha
I'm not familiar with that year, but, if it's just a hydraulic switch in the brake line or master, all you have to do is get the new switch in one hand and unscrew the old one with the other hand. As soon as it is out put the new one in. You want to avoid loosing a significant amount of fluid or introducing air into the system. (A little fluid coming out will prevent air from getting in. Just don't let it drip for 5 minutes while you unpack the new switch.)
Brake fluid makes good paint stripper, so be careful.
Brake fluid makes good paint stripper, so be careful.
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Road Master
Joined: Oct 2021
Posts: 1,033
Likes: 543
From: SC
Light
I don't know if this method applies to your bike. Some of us old bastards remember when the brake and throttle housing had to be in contact with each other to create a ground to keep that brake light from staying on. Good luck.
Stage I
Joined: Jun 2018
Posts: 1
Likes: 1
From: Northern Ireland
Switch
Just did and when I turned the Ignition on, the brake light was off. When I plugged it back in, the brake light came on again. Does that point to a faulty rear brake switch? Don't mean to ask simple questions, I am just not very mechanically inclined when it comes to motorcycles and electrical stuff.
Last edited by victorlonsdale25@gmail.com; Dec 4, 2024 at 09:48 PM. Reason: Extra information
