CB900/919 - Rev Counter Issues
I'm a new entrant to the community here having recently bought a 2003 Hornet 900. I'm loving the bike so far but it has an issue in that the tach / rev counter doesn't work. It sweeps on power up but doesn't register the revs.
I've read as many threads as I can find on various forums but all my efforts so far have not worked, so I'm hoping someone here may be able to suggest something that I've missed.
The bike has been over at some point in its history and has had a set of later gauges fitted as part of the repair (the ones with 2 trip meters and a clock). Here's what I've checked so far;
1. The Yellow/Green wire has continuity from the ECU to the plug in the headlight.
2. The Green/Black wire grounds back to the frame from the plug in the headlight. (I lifted the tank and cleaned the earth connection too.)
3. Disassembled the gauges to check for burnt out / loose connections and stripped the wire harness completely to check for breaks and continuity - all looks good.
4. Checked that the peak voltage is over 10.5V on the yellow green wire as suggested by the service manual. (It's over 12V, pic attached).
As the signal and wiring all looked ok I assumed the gauge must be broken so I bought another set of 2004 gauges, changed the pinout for the white plug, but on starting the engine it was just the same, the gauge swept but still didn't register any revs.
It could be that the second set of gauges also has a busted rev counter but that would be pretty unlucky.
Am I out of options here or is there anything else I can check?
Any advice gratefully received.