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No Brake lights

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Old May 22, 2021 | 02:29 PM
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Default No Brake lights

Greetings all.
looking to see if I can get some ideas on my brake light problem.. last time I rode my bike I noticed. Well atleast I thought that my brake lights where stuck on. However after getting it into my shop and removing the rear lense I noticed that I didn't have any brakes lights at all.. checked the flatmate and they are fine.. I am a electrician by trade. So I knew to start simple. Checked the fuse and it was fine. Also pulled the relay and it seemed to be OK. But I did stop off at the dealership to buy a new one. Plugged it in and still the same. So I checked the rear brake switch wires. Because they had a recall that year.. the wires are fine. I checked for continuity on the switch itself. That's fine. I had power coming in and I put a jumper between them still nothing. So I went and checked all of my connections from the tail light to the fuse block which is on the left side.. I also took a hot and connected it to the brake light wire that goes back through the harness. Came on like its suppose to. So now I am at a point where I would appreciate some input. Am I missing something. As an electrician I know to keep it simple and don't rely on new bulbs and etc. So I tried another relay and still nothing..
my bike is a 2012 roadking classic.. thanks for any help....

 
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Old May 23, 2021 | 09:50 AM
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Does the bike have Anti Lock Brakes?

Bikes with ABS use a different circuit layout to power the brake lamps.

The brake switches send a signal to the ABS control, and to the ABS Diode Pack, then on to the brake relay (pin 86).

See if there is voltage at the wire for relay pin 86 when either brake is activated.
 

Last edited by Dan89FLSTC; May 23, 2021 at 10:19 AM.
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Old May 23, 2021 | 11:14 AM
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Originally Posted by Dan89FLSTC
Does the bike have Anti Lock Brakes?

Bikes with ABS use a different circuit layout to power the brake lamps.

The brake switches send a signal to the ABS control, and to the ABS Diode Pack, then on to the brake relay (pin 86).

See if there is voltage at the wire for relay pin 86 when either brake is activated.
yes I do have the abs.. not sure if this matters or not.. but I also just upgraded the speedo to Harleys one with the tach and gas gage. I didn't notice if the brake light was working then. Pretty sure it was.. I will check it out when I get back out into the shop.... thanks big time for the help !!
 
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Old May 24, 2021 | 03:40 PM
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ABS Diode pack location and Schematics





 
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Old May 24, 2021 | 05:55 PM
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Default Fixed

Well after tracing everything down o found out that it was one of those problems that was just because...this morning I went out and now I didn't have any power to the brake system at all.. trippled checked all of the fuse again. Cleaned every connection that I could find including the fuses. After that bam. The brakes lights started working.. so thanks for the help and thanks for the diagram.. I will put it my manual....
 
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