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Gear Sensor Wires

 
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BTalley



Joined: 25 Apr 2022
Posts: 3

PostPosted: Tue Apr 26, 2022 12:01 am    Post subject: Gear Sensor Wires Reply with quote

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: 10018
Location: Bumf***, WA

PostPosted: Tue Apr 26, 2022 12:45 pm    Post subject: Reply with quote

Look at the link below to see how it works. There's table half way down the page that shows which wires are grounded for each gear.

http://www.kbikeparts.com/classickbikes.com/ckb.tech/0.ckb.tech.files/gpi/gpi.htm
_________________
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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Flying Duck
PsyKotic Waterfowl


Joined: 27 Jan 2005
Posts: 10018
Location: Bumf***, WA

PostPosted: Tue Apr 26, 2022 12:53 pm    Post subject: Reply with quote

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: 10018
Location: Bumf***, WA

PostPosted: Tue Apr 26, 2022 12:57 pm    Post subject: Reply with quote

If you don't care about the gear but just want to be able to detect neutral for starting then you can build one of these pretty easily:

http://www.kbikeparts.com/classickbikes.com/ckb.tech/0.ckb.tech.files/gpiemulate/gpiemulate.htm
_________________
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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BTalley



Joined: 25 Apr 2022
Posts: 3

PostPosted: Tue Apr 26, 2022 11:47 pm    Post subject: Reply with quote

Flying Duck wrote:
Look at the link below to see how it works. There's table half way down the page that shows which wires are grounded for each gear.

http://www.kbikeparts.com/classickbikes.com/ckb.tech/0.ckb.tech.files/gpi/gpi.htm


This is very informative. Thank you.
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BTalley



Joined: 25 Apr 2022
Posts: 3

PostPosted: Sat Jul 23, 2022 12:31 pm    Post subject: Reply with quote

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: 10018
Location: Bumf***, WA

PostPosted: Sat Jul 23, 2022 2:11 pm    Post subject: Reply with quote

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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View user's profile Send private message
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