BMW K bikes (Bricks)


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1Back to top Go down   Neutral Light Empty Neutral Light Wed Nov 02, 2022 8:06 am

Mickman

Mickman
New member
New member
scratch scratch
I have just purchased a k100 It has a problem in that the neutral light stays on . All gear numbers are displayed when riding. Im not too smart with electrics however I have removed the switch from behind the swingarm and cleaned it several times No change.What next???

    

2Back to top Go down   Neutral Light Empty Re: Neutral Light Wed Nov 02, 2022 10:03 pm

robmack

robmack
Life time member
Life time member
Possible that the gear indicator circuit card in the OEM gauge is broken.  Run the following test.
1. Temporarily disconnect the clutch switch from the harness
2. Turn on the Ignition.  Put the bike in first gear
3. Measure the voltage on Pin 5 (Black/Green) on the cable connected to the back of the OEM cluster.

If you measure 10V or more, then it's a sure sign the GPI board is defective.


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

3Back to top Go down   Neutral Light Empty Re: Neutral Light Wed Nov 02, 2022 11:04 pm

duck

duck
Life time member
Life time member
robmack wrote:Possible that the gear indicator circuit card in the OEM gauge is broken.  Run the following test.
1. Temporarily disconnect the clutch switch from the harness
2. Turn on the Ignition.  Put the bike in first gear
3. Measure the voltage on Pin 5 (Black/Green) on the cable connected to the back of the OEM cluster.

If you measure 10V or more, then it's a sure sign the GPI board is defective.

Even if the clutch switch is shorting then that still shouldn't illuminate the neutral lamp. 

If things worked that way then the N lamp would illuminate every time that you pull in the clutch to shift gears.

If the gear indicator shows something other than zero and that lamp is on then it's a GPI circuit board gone bad.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

4Back to top Go down   Neutral Light Empty Neutral Light Thu Nov 03, 2022 4:08 am

Mickman

Mickman
New member
New member
Thanks for the response Will annoy my brother now as he has more electrical knowhow than me plus he has had his instrument cluster apart before.

    

5Back to top Go down   Neutral Light Empty Re: Neutral Light Thu Nov 03, 2022 5:06 am

duck

duck
Life time member
Life time member


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

6Back to top Go down   Neutral Light Empty Re: Neutral Light Thu Nov 03, 2022 5:57 am

robmack

robmack
Life time member
Life time member
duck wrote:
Even if the clutch switch is shorting then that still shouldn't illuminate the neutral lamp. 
I don't suspect the clutch switch as the culprit in this scenario, Duck.  I suspect the GPI board also; specifically the neutral and start enable transistors. I had the first step being taking that switch out of circuit to reduce the number of variables during testing.

Another quick test is to put the bike on the centre stand, turn on the ignition, put it in first and press the start button.  If the starter cranks, then the GPI board is defective.


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

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