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BTalley
Joined: 25 Apr 2022 Posts: 4
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Posted: Tue Apr 26, 2022 12:01 am Post subject: Gear Sensor Wires |
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Hello everyone!
First time poster here. I got a 1995 BMW K1100 LT that I’ve been taking down the cafe racer path. I’ve come across a peculiar subject that got me curious. I took out the clunky original instrument cluster and (for the time being) installed basically a Chinese led dash that does the job. The Chinese dash has 5 (with possibility of a 6th) gear wire connectors. But I have noticed the bike only has three along with a neutral. How do these three wires work? Is there some sort of logic like one wire means one gear while two active wires means another? I’d love any feedback as to how this works and if anyone managed around it. Otherwise, I’ll just listen and feel the RPMs to shift. |
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Flying Duck PsyKotic Waterfowl
Joined: 27 Jan 2005 Posts: 10087 Location: Bumf***, WA
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Flying Duck PsyKotic Waterfowl
Joined: 27 Jan 2005 Posts: 10087 Location: Bumf***, WA
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Posted: Tue Apr 26, 2022 12:53 pm Post subject: |
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Don't know if still has any but this guy makes a workaround unit:
http://www.motobrick.com/index.php?topic=6097.0 _________________ 93 LT (x2)
94 RS
86-97 K75F(K75/100/1100 Frankenbrick)
86 K75C w/paralever, hi perf cams,TURBO!
91 & 92 K75Ss
91 K1
86 custom K100
14 WR250R
IBA #17739 (SS1K, BBG, 50CC)
Buy parts HERE
Last edited by Flying Duck on Tue Apr 26, 2022 1:37 pm; edited 1 time in total |
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Flying Duck PsyKotic Waterfowl
Joined: 27 Jan 2005 Posts: 10087 Location: Bumf***, WA
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BTalley
Joined: 25 Apr 2022 Posts: 4
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Posted: Tue Apr 26, 2022 11:47 pm Post subject: |
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This is very informative. Thank you. |
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BTalley
Joined: 25 Apr 2022 Posts: 4
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Posted: Sat Jul 23, 2022 12:31 pm Post subject: |
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I ended up designing my own logic gate system to fix the issue. However, the logic LCs I’ll be using are rated for 3.3 to 5 volts. I tried measuring the voltage on some of the gear position wires but got nothing. Does anyone know what voltage gets sent through the wires? Really just want to know if it’s 12 volts so I will know if I need a regulator. |
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Flying Duck PsyKotic Waterfowl
Joined: 27 Jan 2005 Posts: 10087 Location: Bumf***, WA
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Posted: Sat Jul 23, 2022 2:11 pm Post subject: |
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BTalley wrote: | Does anyone know what voltage gets sent through the wires? |
0 volts.
The gear position PCB in the cluster senses open/closed circuits to ground.
_________________ 93 LT (x2)
94 RS
86-97 K75F(K75/100/1100 Frankenbrick)
86 K75C w/paralever, hi perf cams,TURBO!
91 & 92 K75Ss
91 K1
86 custom K100
14 WR250R
IBA #17739 (SS1K, BBG, 50CC)
Buy parts HERE |
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