SF3 diode

[macavity99]

Why is there a rectifier diode in the wiring loom between junction 15 and the light switch? I suspect it is used with the parking position on the ignition switch -- second position and remove key should leave parking lights on (doesn't work on my bike).

The diode looks the wrong way round on the wiring diagram -- forward biased from J15 to switch. Should this be the other way?

Can anyone clarify?

Cheers

 

[Ernesto]

See this thread: http://www.laverdaforum.com/forum/index.php?topic=41411.msg62281#msg62281
Francois' and Piet's answers clear it up.

Ernesto

 

[macavity99]

Ok, so in park position, without this diode, the entire bike will be powered back through J14 - J15 - light switch - fuse 2. Not a good wiring layout Laverda.

The green book diagram is wrong. With diode as shown, the bike WILL be powered as described above. Possible latent failure mode here, if diode goes short circuit the bike will be powered in park but you won't know it. 

Cheers

 

[Dellortoman]

The diode is arse about in the early triple wiring diagram too, as I discovered a couple of years ago (see this thread http://www.laverdaforum.com/forum/index.php?topic=80739.msg135731#msg135731). I don't think anyone believed me at the time.

Someone in the factory must have noticed because it was fixed in the wiring diagram for BTZ ignition models (post 1977).

Cheers,
Cam

 

[macavity99]

The park position doesn't work on my bike, don't know why. In any case, I have never wanted to use it, so I might remove the diode and disable the park thing. If I can be bothered.  8)

Cheers

Steve