Horn button problem on SF2

The french say "la nuit porte conseil" (night brings councel) and the english say "sleep on it". By earthing the horns independantly, I've closed the loop and excluded the switch in the original earth (the button), hence they work full time.
I'll go and check later on.
Ciao a tutti
Paul
 
Problem is definitely earth. Took direct earth from horns off, and now no horn at all. Need to earth switch I imagine. Any ideas?
Paul
 
Looks like I f....d it up from the start: over 12 V in the lead I labelled: button! Must have inversed live and earth from the start.
Will get back in there next week end. Will be away a few days.
Paul
 
LAVERDA SWITCHES ARE ON THE EARTH SIDE  :o :o :o

This should be written in large print on any technical document relating to Laverdas.
I had indeed inversed original leads to horn so that what I'd labeled as switch was in fact a +.
All working fine.
What I don't understand is why I ran two seperate earths from the horns to the battery leading to constant noise as soon as the ignition was on.
I now have a superfluous + tucked away in the headlight.
I also ran a direct earth from battery to headlight which had been trying to earth via headlight bracket. I now have one very bright headlight and also understand why the same bulb had been in there since the 70s. Low volts = low wear!
Ciao
Paul
 
It sounds confusing, Paul, but I?m pretty sure that it is only the horn button that is on the earth side, as it is on every bike I can think of.
Most horns have two terminals, power to one and the other to earth via the horn button.
Headlights are power in to switch which sends it to high or low.
Blinkers are power (via the flasher relay) in to switch, thence to L and R.
Kill switch wire is power in and sent to coils (and start button is power to starter relay).
 
Tippie said:
It sounds confusing, Paul, but I?m pretty sure that it is only the horn button that is on the earth side, as it is on every bike I can think of.
Most horns have two terminals, power to one and the other to earth via the horn button.
Headlights are power in to switch which sends it to high or low.
Blinkers are power (via the flasher relay) in to switch, thence to L and R.
Kill switch wire is power in and sent to coils (and start button is power to starter relay).
Click to expand...

Starter button is also via earth I think.
Paul
 
Um not on the RGS, starter switch gets powered from the kill switch, then to the solenoid, the other side of the solenoid goes to ground.
 
Dellortoman said:
Not just RGS - it's the same on earlier Lavs. The kill switch isolates the starter button.
Click to expand...

Hmmm. Thanks for that. Made me check my wiring and realised I had power going into the switch on the wrong wire and that the starter would work and turn the motor over even with the kill switch in the off position. Mind you, could be useful for running compression tests etc  ::)
 
Davo said:
Hmmm. Thanks for that. Made me check my wiring and realised I had power going into the switch on the wrong wire and that the starter would work and turn the motor over even with the kill switch in the off position. Mind you, could be useful for running compression tests etc  ::)
Click to expand...

Where possible I always wire my bikes like that.  It allows you to turn the engine a few revolutions with the ignition off to ensure you don't have a cylinder full of fuel.  Habit of mine by now.
Cheers
Steve
 
That's how we wired reds dyno up as he likes to turn them over to get the oil through and make sure it's all OK before starting it up.

As I mentioned before, it's also how the BMW is wired up which I think is odd!
 
drikko said:
As I mentioned before, it's also how the BMW is wired up which I think is odd!
Click to expand...

May be odd but it isn?t unusual. Guzzis and Morinis of the era are the same. It allows you to flatten your battery with the starter motor just before you remember that you used the kill switch.  :LOL:

The Alpino is the only bike I have that the kill switch also disables the starter motor. Smart really.  ;)
 
Hey Steve, aren't you running Ignitech systems on your bikes?

I presume you're aware that you can program number of engine revolutions before starting. I have mine set on 1, so it does one complete revolution before firing the spark plugs, just to eliminate any potential issues with hydraulic lock. I figure if it does 1 rev OK, it's all clear.

Cam

 
drikko said:
Um not on the RGS, starter switch gets powered from the kill switch, then to the solenoid, the other side of the solenoid goes to ground.
Click to expand...

You're certainly right. It just I've got used to bikes without kill switches.
Doesn't the early 750 starter switch operate on the earth loop?
Paul
 
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