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Horn ground 16 Dec 2013 12:37 #615634

  • Schmeck
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Can someone tell me where the kz750 b4 horn grounds ? It stopped working a while bike and am just not looking into it . Everything works except the horn. Will check to see if it's getting power later but right now I'm wondering where it grounds out and what wire is the ground in case no power is found in either.
1979 kz750 twin -Soon to be roadworthy
1988 El250 engine in custom hard tail frame - collecting dust

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Horn ground 16 Dec 2013 12:42 #615635

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"Just now looking " typo my bad .
1979 kz750 twin -Soon to be roadworthy
1988 El250 engine in custom hard tail frame - collecting dust

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Horn ground 16 Dec 2013 12:51 #615636

  • bountyhunter
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I thought it made a direct ground to the frame?
1979 KZ-750 Twin

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Horn ground 16 Dec 2013 12:54 #615637

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Here's the wiring diagram:
1979 KZ-750 Twin
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Horn ground 16 Dec 2013 12:57 #615638

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It looks like the black wire is the ground side and it goes through the button switch to ground.
1979 KZ-750 Twin

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Horn ground 16 Dec 2013 13:10 #615639

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Would having black handlebars keep the switch from grounding ? I read that somewhere .
1979 kz750 twin -Soon to be roadworthy
1988 El250 engine in custom hard tail frame - collecting dust

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Horn ground 16 Dec 2013 13:25 #615642

  • JR
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Sounds like my horn button. I had a bad ground last year and had to take the left hand switch gear apart and clean with contact cleaner and Q tips. It was like doing micro surgery. A PITA.
I have black handlebars also but I dont think it matters. As far as I remember the other switches in there have ground wires and the horn ground is through these. `Pretty sure but not totally.
1980 kz750E1, Delkevic exhaust

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Horn ground 16 Dec 2013 13:53 #615646

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maybe it just needs the contacts cleaned . not home now but just trying to get ideas of what could be wrong .
1979 kz750 twin -Soon to be roadworthy
1988 El250 engine in custom hard tail frame - collecting dust

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Horn ground 16 Dec 2013 14:27 #615649

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it should be easy to test the horn by just running a wire from the horn (black wire contact) to ground. If the horn sounds then the fault has to be further along - either wire to handlebar switch broken or bad ground in the switch itself.
Good luck
1980 kz750E1, Delkevic exhaust

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Horn ground 16 Dec 2013 14:50 #615656

  • rstnick
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Some handle bars will not let the switch ground.
I had that problem with a set of black bars I installed on my 650.
Had to run a separate ground wire to the left hand handle bar switch.
Rob.
CANADA
forums.kz650.info/
'78 KZ650 C2, 125K kms, Rickman fairing, Delkevic ex, EI, K&N, ATK fork brace, steering damper, braced swingarm, 18" Z1R front wheel.
'00 ZRX1100, Ohlin's shocks, fork brace, steering damper, ELS +4, Corbin seat, Gimbel bugspoiler.
'11 Ninja 250R

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Horn ground 16 Dec 2013 15:51 #615661

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I just had my left switch assembly apart on my kz1000. I can tell you that the horn would not work until I bolted the switch assembly back on to the handlebars. So that tells me that it grounds through the handlebars. You could test this by taking the switch halves apart and running a ground wire to the horn switch. If that makes it work, then maybe sand a little of the black paint off underneath the switch?
'77 KZ1000-MTC 1075 kit. Stage 1 port

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Horn ground 16 Dec 2013 17:56 #615666

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Okay did some testing and yes my handlebars are keeping the horn from grounding. i put the housing against the frame and was getting 15v down to the horn wires. so that problem is solved . bought this used horn off a guy cheap who said it came from a running bike . Horn is useless . Need a new one and I am buying brand new this time . Sometimes you cant trust peoples word , seriously .
1979 kz750 twin -Soon to be roadworthy
1988 El250 engine in custom hard tail frame - collecting dust

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