Dead tacho again

[Uboat]

Hi,

I had my rev counter refurbished to fit electronic ignition some years ago, as it was bouncing, and it is now out of order again.
The symptom: the tacho fires up when ignition is on and the engine idles, and sinks slowly to zero after a few seconds and stays dead.

This happened 50 kilometers after the refurbishing the alternator, which became dead again. Can it have anything to do with this?
Any clues?
/Ulf

[billwill]

Just a possibility, but if the alternator became disconnected from the battery while the engine was running it could perhaps have run wild and generated a very high voltage which destroyed some of the electronics in the tacho.

[john.p.clegg]

I had similar symptoms on mine ( after refurbishing ) and I managed to trace it to either a dry joint or split in the circuit board ( it was years ago ) easily cured with a little solder and a hot iron,but for this you need to take it out of its shell and magnifying glass it...

John