Digital Speedometer

hi , all help appreciated. Digital clocks all work fine except for the speedometer which reads 0 . Just pulled the front wheel and checked cables which all appear fine one pinch point which I scraped the cable back and tested with a meter and all ok . 3 pin connector block runs back through the harness but struggling to find which pin no on clock connection I should be testing for continuity anyone experienced theses problems on a speed four / tt600
Any pointers would be nice because I don’t have much hair left to pull out!

 

Just appears to have a two pronged driver within the wheel which spins within the pickup . Bit like the old cable driven speedo on old school bikes before electric was invented !

 

Not sure if anyone had a wiring diagram for the speed four ?

 

Not sure if anyone had a wiring diagram for the speed four ?

 

So . Found this and currently waiting for my outlaw to send me a resistor to make up a test circuit!
However write up says to rotate drive within pickup this would infer that no magnet is required . If a magnet is needed where would be I be able to source a replacement? Avoiding a main dealer and paying a sensible price ?

 

Hi Thanks, I replaced ECU with one purchased off eBay , this maybe the problem . I have switched back to the original but still need to test.
I did not realise that the map could cause this problem, I had already changed back before you posted.

Tested the entire circuit on the cable back to the ECU and achieved continuity and also found an aftermarket magnet and awaiting delivery as Triumph were extortionate! Would have thought this should be sold as an separate part!

Will update you once I get parts and test.
Sure it may help others in the future.

 

Well to conclude , aftermarket magnet fitted , spun wheel and speedo now working!
Dozers Dad was correct in diagnosing magnet problem.
Old bike with ongoing problems but nearly at a conclusion and ready for its MOT and back on the Road.
never realised speedo was routed through ECU but hope this info may help someone else in the future

 

Thanks also to D’ecosse for his advice much appreciated