Lotus Elan

Dead tacho again

PostPost by: Uboat » Wed Oct 01, 2014 6:53 am


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?
1974 Lotus Elan +2 130/5
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PostPost by: billwill » Thu Oct 02, 2014 9:55 am

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.
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PostPost by: john.p.clegg » Thu Oct 02, 2014 11:18 am

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...

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