Lotus Elan

Temperature Gauge

PostPost by: acoster » Mon Jul 02, 2012 9:34 am

My temperature gauge alarmingly and quickly goes to 130 degrees and stays in red, but I don't think the engine is overheating - it shows as overheating too quickly and drives OK. Could this be the voltage regulator? I changed the transmitter and thermostat but no difference. Or is it a rouge gauge?
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PostPost by: john.p.clegg » Mon Jul 02, 2012 3:01 pm

Could be the Voltage regulator,how are your fuel and oil gauges reading..

John :wink:
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PostPost by: acoster » Mon Jul 02, 2012 3:36 pm

Well - I run out of fuel when it said 1/4 full at the weekend, but it seems to have recovered now I put some fuel in and shows full. Oil pressure only goes to 60-ish and its on that pretty much - not sure what its supposed to be....? doesn't seem to reduce after a journey....
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PostPost by: stugilmour » Mon Jul 02, 2012 4:27 pm

I would suspect the voltage stabilizer, the small component that supplies 10v to the temperature and fuel gauges. It is located on the back of the dash near the two major gauges. The stock ones use a bimetallic strip type deal. 10v output voltage cannot be reliably checked with a voltmeter as they are going off and on rapidly to supply an average 10v; the gauges are damped enough they don't move. You may be able to check the stabilizer output for ~12v to say ~13.5v to see if the devise has failed with the bimetallic strip in the electrically closed position.

Solid state replacements are available from Moss, or I believe John made some up a while ago. :) I would just replace the thing and try things out as the component is pretty cheap & easy to get at and they are known to fail. The solid state units can be checked with your voltmeter for 10v output.

http://www.mossmotors.com/graphics/prod ... 31-555.pdf

The fuel gauge behavior sounds like it is being supplied with over 10v and the gauge reading is shifted up. Mine works correctly (sort of) in the critical lower range, but will never get to a proper full reading. Note the low fuel light should work correctly as it is a separate circuit from the tank sender. 12v supply to the two gauges would also account for your high coolant temp readings.

Once sure of the 10v supply to the two gauges, I still had to 'adjust' my temp gauge with additional resistors in series with the sender to get it to read correctly at various temperatures determined with candy thermometer in the coolant.

Note the oil pressure does not use 10v stabilized supply, rather it uses nominal 12v so should be different issue, although it sounds OK to me.

http://www.lotuselan.net/uploads/smiths ... wiring.jpg

Good luck with the repair. HTH
Stu
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PostPost by: acoster » Tue Jul 03, 2012 9:34 am

Many thanks will try a voltage stabiliser - solid state this weekend I hope if it arrives in time
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PostPost by: acoster » Mon Jul 09, 2012 12:13 pm

Voltage Stabiliser now fitted and the gauge is out of the red - still maybe reading high, will run it and see how I get on.
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