BMW K bikes (Bricks)


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1Back to top Go down   New Member Empty New Member Wed Jan 27, 2016 12:03 am

BMWRIDER275

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Hello, I just picked a 1985 K100 Standared, I'm having an issue with the Neutral light not working and i just installed a new gear indicator switch but still no Joy as yet.

    

2Back to top Go down   New Member Empty Re: New Member Wed Jan 27, 2016 12:43 am

92KK 84WW Olaf

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Welcome to the forum, good to see you along.

I know it might be the obvious but.....was it a new gear indicator [GPI] switch? They do go faulty. Only other place I can figure is blown bulb or the connection on the other end of the wire but someone else will come along with more information.

With no neutral light you must pull in the clutch lever to start the bike.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 48,061 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 61,190 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

3Back to top Go down   New Member Empty Re: New Member Wed Jan 27, 2016 1:04 am

BMWRIDER275

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Yes it's a brand new one from the dealer. The old one was cracked and the springs had disintegrated. I figured just stop with the new one.

    

4Back to top Go down   New Member Empty Re: New Member Wed Jan 27, 2016 2:56 am

Rick G

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The connections inside the cluster on the GPI circuit board do get corosion and need resoldering sometimes. I cant be any more specific than that as I have never had to do one.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1999 K1100 LT with a Big Block 1200
    

5Back to top Go down   New Member Empty Re: New Member Wed Jan 27, 2016 3:00 am

BMWRIDER275

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I will give it a look over the next few days. Thank you so much for your help. I copied some wiring diagrams to aid in my troubleshooting.

    

6Back to top Go down   New Member Empty Re: New Member Fri Jan 29, 2016 5:07 pm

Born Again Eccentric

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BMWRIDER275 wrote:I will give it a look over the next few days. Thank you so much for your help. I copied some wiring diagrams to aid in my troubleshooting.
Welcome - sorry, I didn't see your post earlier in the week! 

Not quite sure why your forum name is a full email address, but bearing in mind any old non member can access the forum as a guest through the dear old www, you could get unwelcome email and spam (rather than genuine, helpful advice and banter from forum members). My advice would be to go into your profile and perhaps remove everything after the "@". Changing your name is possible and immediately changes it on all your posts so protecting your identity. When contacting other members for meet ups, buying/selling spares etc., then contact is done by Private Message (PM) which is personal to you and the other member and can't be seen by other members/guests. 

Anyway, enough of that back, to the problem in hand - You may find the following link helpful with your trouble shooting:

https://www.k100-forum.com/t10495-gear-indicator-board-for-1985-k100rt-instruments#124102

The easiest way to determine if it is the new GPI switch or the GPI LCD or even the green neutral light that is duff is to test from the connector on the right hand side of the bike (near the fuel pump connector and rear brake light connector). 

If you separate the plug and socket, you can test the LCD and neutral light by connecting the various pins to earth (see the link above for which pin does what). Pins ABC all connected to Earth should give you "0" on the LCD and a Green neutral light. If you get just the "0", then it is likely the neutral light is blown (instrument cluster needs to come off bike, back comes off and you can remove/test all instrument bulbs while you're in there). If you get neither the "0" or the green light, then it suggests that the problem lies with the LCD circuit board. 

If you get both Green light and "0" indication, then your problem lies with either the connector (clean up plug pins and socket) or the GPI switch. Again, as detailed at the link, you can check the output of the switch in each gear (1-N though 5) by checking for continuity with a test meter connected to the various pin combinations. It is entirely possible that the switch is OK (and it should be) but may be misaligned by a small amount and therefore not giving the reading it should do to correspond with the gear selected - this was the problem I had. Realigning my switch solved the problem (PiTA to have to strip down the back of the bike again though) and it has worked perfectly ever since.

Good luck



Last edited by Born Again Eccentric on Sat Jan 30, 2016 8:30 am; edited 1 time in total


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New Member Uk-log10 New Member Sco-lo15
                              Paul  New Member 905546712

"Heidi" K100LT 1991 (Grey) (VIN 0190172 Engine No. 104EB 2590 2213) - 5th owner. January 2014 (34,000 - 61,000 miles and counting....)
"Gretel" K100LT 1989 (Silver Grey) (VIN 0177324 Engine No. 104EA 2789 2211) - 4th+ owner. September 2015 (58,500miles and counting....). Cat C Insurance write-off rebuild Feb 17
"Donor" K100LT 1990 (Red)  (VIN 0178091 Engine No. 4489 2024) - 6th & final owner (crash write-off now donor bike).   June 2012 (73,000 miles) to November 2013 (89,500 miles)
    

7Back to top Go down   New Member Empty Re: New Member Fri Jan 29, 2016 5:17 pm

duck

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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
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8Back to top Go down   New Member Empty Re: New Member Sat Jan 30, 2016 1:06 am

BMWRIDER275

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Thanks guys, this is great I'm sure with the info provided I'll have this licked tomorrow. I will report back with my results. thanks again you guys are awesome.

    

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