Smoothing out electrical pulses.

It came from the same business as the clock. (So I may have to ask them)

I'll have a go with it this aft but not cut the wire and position the sensor between plug and mag = distance. (Unless anyone thinks different.)

Thanks...

Smoothing out may have been the wrong word.

In short: Electronic rev counter not showing engine speed when running. Needle not moving.

I have an ignition switch fitted for security and the the needle goes round and back when switched on.

Anyone used a Smiths electronic rev counter in conjunction with a mag?

Thank you Jon.

I'll give this a check out.

I don't think my positive earth is the issue.

Will report back.

Thanks again,

Neil.

Hi Jon,

I tried and then other combinations but couldn't get the needle to move.

Also I tried attaching the sensor to just below the other plug.

I may have to ditch the mag and buy a Boyer and coil pack, but not just yet as I know this can be done. Missing a trick, that's all.

Thank you for your help and interest.

Appreciated, 

Neil.

I noticed that the sensor was hot while the HT leads stayed cool.

I wonder if there is a fault with the sensor?

Still not working.

I Originally wanted to fit a mechanical clock I could get hold of BUT I couldn't find a suitable timing case anywhere.

Same issue with my 650, but with Boyer, coil and power box it was straight fwd.

I know this can be done with a mag. 

Bit late for that, Gordon, especially on my no expense spared Dommie Racer.

Will try out Jon's suggestion and report back.

Cheers,

Neil.

Hi Jon,

My wiring colours are not as per diagram, also included is a photo.

I have a Paul Goff ignition switch and tests were with ignition ON.

Conversion:

Green is Black (Supply) 12.44v

Brown is white (Signal)

Red (Ground) Pos 11.85

Current 4.4 DC.    Amps & MA ?

Dabbed = 0 Volts

The bike is Pos Earth.

Hope this helps. And thank you for your interest.

Hi Jon,

The issue is that the signal adapter does not mention polarity but the tacho can do either.

See photo.

All my bikes are positive earth so I am always sure to mention that.

Smith's (Puca) put me in touch with this other company to buy the clock as they also sold the signal adapter. 

ATB,

Neil.

Thank you Jon,

Will connect the red wire direct to the battery.  It sounds promising.  (Pos Earth)

Thanks,

Neil.

Thanks Jon and John,

Well the day arrived, all wired up as bite size. It meant taking the back wheel off and the battery out + a re-design of the seat and rear mudguard fitting arrangements. (Took time)

Anyway, all done and started the engine (4 kicks) but sadly no go on the tacho.

Now remember, when I first tried this out without help, I found the sensor got very hot but not the HT lead. The actual sensor appears to have melted a little after that.

This time the sensor did not get hot. I hope because it is now wired up correctly but perhaps the sensor is knackered. I think John raised a good point.

Anyway gents, do I buy a new sensor or can I first test this one. 

I know we will solve this one.

Neil.

Thanks Mikael,

If  push comes to shove I suppose this would prove that the new head is working, but right now my thoughts are with the sender, which may have been damaged..

Cheers,

Neil.

Many thanks Gents:  (Jon and John)

A new sensor will arrive in the morning.

I'll let you know, either way.

Thank you,

Neil.

Sorry about the wait, gents, a lot going on.

I did get the needle to move a little but not much. But at least I know we are on the right track.

John H's resistor idea is certainly worth thinking about. Pictures below.

Inside the headlamp  (Resistor?) 

Wiring under the tank before tidying it up.  

Finally the almost finished machine !

Many thanks,

Neil.   

Thank you Jon and John.

I looked into resistors but all I could find are those related to flasher units.

I wonder if AO sells something suitable?

Then there is the question of how and where it will be wired.

There was nothing in the instructions about adding a resistor.

Thanks...

Cheers John.

First thing is to find a 33 ohms resistor

Then connect to the red cable to the battery, I assume inside the headlamp,

This must also include the sensor.

Thank you, John, I'll have a go.

Thanks Barry, I'll take a look at that.

Just wondering if it's a mirror image?