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K100-forum.com » Technical, repair and troubleshooting » Electrical » Horn stuck on??

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1Back to top Go down   Horn stuck on?? Empty Horn stuck on?? Mon Sep 02, 2019 6:17 pm

giltgy

giltgy
New member
New member
When I initially powered up my bike(85 K100RT) the horn started
to blow until I unplugged at the horns. Does anyone know what could
be the cause of this. I have disassembled the switch assembly on the
left grip, and cannot see any obvious cause. Is it possible that the relay
is stuck on? The bike sat for many years(23?) before I got it and began to
get it roadworthy once again.

Thank you,
Guil

    

2Back to top Go down   Horn stuck on?? Empty Re: Horn stuck on?? Mon Sep 02, 2019 6:42 pm

volador

volador
Platinum member
Platinum member
Hit the horn firmly with a blunt instrument to unstuck it

Good Luck with your moto



Last edited by volador on Mon Sep 02, 2019 6:56 pm; edited 1 time in total


__________________________________________________
1984 K100RS  1991 K100RS  Reap The Wild Wind... Ever Commute Is An Adventure
    

3Back to top Go down   Horn stuck on?? Empty Re: Horn stuck on?? Mon Sep 02, 2019 6:55 pm

Suzi Q

Suzi Q
Life time member
Life time member
Maybe it's like when you bring an Egyptian mummy back from the dead - they're sort of fixated on whatever bad things happened to them all those years ago and they end up running round causing mayhem trying to deal with it, and making lots of noise.
Maybe your K100 had a bad experience before it was laid up, something scary, the horn was sounded?

Here's a picture of what I mean:
Horn stuck on?? Mummy10


__________________________________________________
Sometimes I'm not really Suzi Quatro.
    

4Back to top Go down   Horn stuck on?? Empty Re: Horn stuck on?? Mon Sep 02, 2019 7:04 pm

volador

volador
Platinum member
Platinum member
I felt the same way this morning!


__________________________________________________
1984 K100RS  1991 K100RS  Reap The Wild Wind... Ever Commute Is An Adventure
    

5Back to top Go down   Horn stuck on?? Empty Re: Horn stuck on?? Mon Sep 02, 2019 8:53 pm

Laitch

Laitch
Life time member
Life time member
Fix it soon; that mummy-wrap can chafe. Whack the relay, clean the handlebar switch.


__________________________________________________
1995 K75 90,000 miles
    

6Back to top Go down   Horn stuck on?? Empty Re: Horn stuck on?? Mon Sep 02, 2019 11:37 pm

Dai

Dai
Life time member
Life time member
It probably is the horn relay. You'll need to remove the fuel tank to get at the relay box - see this thread for ABS bikes:

https://www.k100-forum.com/t10767-relay-identification

and this thread for non-ABS bikes (you don't say what you have - '85 was a changeover year):

https://www.k100-forum.com/t869-testing-temperature-switching-relay


As for the children up there... Horn stuck on?? 167893


__________________________________________________
1983 K100 naked upgraded to K100LT spec after spending time as an RS and an RT
1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

7Back to top Go down   Horn stuck on?? Empty Re: Horn stuck on?? Tue Sep 03, 2019 3:32 pm

92KK 84WW Olaf

avatar
Life time member
Life time member
K100RT. They didn't get ABS at all. DAMHIK


__________________________________________________
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 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 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
    

8Back to top Go down   Horn stuck on?? Empty Re: Horn stuck on?? Tue Sep 03, 2019 4:50 pm

volador

volador
Platinum member
Platinum member
1: Motronic
2: Fan
3: Horn
4: Fuel pump
5: Load shed
Relays are all the same/interchangeable


__________________________________________________
1984 K100RS  1991 K100RS  Reap The Wild Wind... Ever Commute Is An Adventure
    

9Back to top Go down   Horn stuck on?? Empty Re: Horn stuck on?? Tue Sep 03, 2019 5:02 pm

duck

duck
Life time member
Life time member
Horn stuck on?? Relayb1


__________________________________________________
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
    

10Back to top Go down   Horn stuck on?? Empty Horn stuck on? Mon Apr 20, 2020 2:14 pm

geharper

geharper
active member
active member
I also have a 1985 K100RT with the same problem and it is caused by the alarm unit under the seat.  The alarm unit has a rechargeable battery and I found that mine was leaking with corrosion on the circuit board.   I replaced the battery and cleaned it the best I could, but I still have the problem with the horn blowing.  There is a small relay on the circuit board that I have verified that the contact closure is blowing the horn.  Your issue may be different.

    

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