Silicon rectifier

[rosco]

HiAll. After taking a year off to move house to Norfolk and do it up I am now back in the garage
Set up the engine which now runs like a watch Easy to start idles nicely Only problem it won’t start off the button When I short the solenoid it starts. Have checked the solenoid across the battery and it clicks so switching
The Green and Red wire from the solenoid goes to the Silicon Rectifier A new loom has been fitted but the rectifier differs between the old and new loom  Will this be the problem? The supplier of the new loom suggested trying another rectifier Which I have but still no go see attached photos the image of the diode differs -  +.  +. - with a diode allowing current flow only in one direction this can’t be right  Help not much hair left Cheers Ross

[rosco]

Hi  Photos one/two  show the old loom with g/r to positive through the diode to negative
     Photos three/four show new loom with g/r  to positive but the diode the wrong way
     Is it as simple as removing the wires from the plug and reversing them??   and fitting the old rectifier in correct orientation + at the top of the diode?
   
    Cheers Ross


           

[hairygit]

That is a silicone diode, NOT a rectifier. It is part of the starter safety circuit (blame the yanks and the sue everyone culture) Basically it locks out the starter motor unless the clutch is pulled in or the bike is in neutral. Do you have the clutch switch (between the lever and switchgear) fitted and connected? If not, it won't play nicely, connections for it are in the headlight shell.

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[rosco]

Hi Mr Hairy,    Yes all connected up Just No go   
                  In the manual , following the dark green/red it goes to the clutch switch via the headlamp With a junction to what they call a Silicon Rectifier showing a picture of a diode Is this wrong !!!!  Sorry electrickery not a strong point   Everything works except the starter motor yet getting power to the solenoid via the yellow/red wire from the starter button And the solenoid checks out as good So looking at the dark green/red wire for problems      Ross

[rosco]

 Hi OJ 
        When clutch switch disconnected in the headlamp bowl i put a meter across them to test continuity
        When the clutch lever is pulled i do get continuity so assume all good  and working with the switch

       Cheers Ross

[Bryanj]

Pull the diode and check for contiuity between solenoid green/red and one loom connector then clutch switch and other loom connector. If both ok diode dead(or wrong)

[rosco]

Hi Bryan
            Dark green/red from solenoid to diode has continuity as does the same wire from the diode to the clutch switch  Also the light green/red from the other side of the diode to the neutral light 
            If you look at the photos 1&2 show old loom where positive dark green /red goes to negative through the diode which i believe is correct
            Photos 3&4  shows  the new loom dark green/red positive goes to negative through the diode in the opposite direction according to the illustration on the diode which i believe it cannot
            Do you think if i changed the wire positions at the plug  around to suit the diode direction  Things might work !!    Ross

[Bryanj]

I dont know, try it

[rosco]

Hi All
       This morning i meter checked the diodes and all three checked out
        so i removed the wires from the diode plug and refit them to suit the flow of chosen diode
      BINGO!!!!  now starts on the button   Thanks for your comments
        Ross

[hairygit]

Nice result! Be sure to tell whoever supplied the loom about that problem, I know it may seem trivial, but had it been an ignition or lighting wire in the wrong place you could end up with a fire very easily!

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[rosco]

One step in front of you      I have already been in contact   Ross
     

[Bryanj]

Glad you sorted it, long distance electrickery diagnosis is a real bugger, i totaly rewired a 750 in the back of a van in about 3 hours for a member on here but faults when its not in front of you are definately the worst

[rosco]

cheers Bryan   As you say remotely trying to fault find is hard  But still hard when your sat in front of it You tend to trust new stuff to be right  Only a slight error on the loom builders part  but a head scratcher at the time  Thanks for the help  Ross