I purchased this new tach from BKRider and the single fire adaptor from e-bay. I have my tach hooked up to an external 12V supply and the tach does initialize (0 to 8K and back)) when it is pluged in.
Each coil shoul have a - and a + and the adaptor wires should go to -
With the engine idling, when I measure from the bike ground to any of the 2 wires on each coil, I get a + reading on all 4 terminals( one red and one black). I did it again and the same + + + + readings. I know that the black should be the - and I hooked up the adapter to these terminals.
Start the engine but the tach stays at 0...
What am I doing wrong here and why the + reading from both terminals of the coil? Any help is more than welcome.
Well from what I remember on most coils they work like this.
Power to the hot side
Wire to plug for spark to travel to
Ground wire is controlled by points or electronic ignition to tell it when to spark.
I not sure details on tach.
Great ideea and thank you much. I will try tomorrow morning.
And just to aviod making any connections inside the headlamp can I just connect the tach's black wire(-) to the bike's ground(frame) and not the battery?
Also, because would be easier I will connect tach's power to one coil(+) and light wire to the other coil(+)
I will connect the ground wire on the bottom screw of one of the coils. And do you think the reason it did not work is the fact that I had the power from the external power supply? Because this is the only thing I will do different now? Thank you again.