Lotus Elan

Oil Gauge Questions

PostPost by: nwbaxter66 » Sat Sep 21, 2019 2:55 pm

1970 Plus 2, during my ownership has always had an electric oil pressure gauge.
Sometimes during the recent work being done on the car (clutch replacement etc.), the gauge stopped working and sender damaged during the work.
Ordered a new sender from RD Ent. Installed it and ran a new cable from sender to gauge.
Pulled gauge from dash and verified that the gauge has two white wires going in and one going out to the sender.
The wiring diagram says that one goes to the security switch in the glove compartment, which still works. The other heads to the rear window heater switch,
Neither cable goes near the voltage regulator.

On start the gauge works and pegs at max pressure.

My guess is that I have installed the wrong sender, is there a way to test this using my trusty multi-meter.
Could it be related to something else?


Thanks
Nick Baxter
1970 Plus 2S (Federal)
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PostPost by: gjz30075 » Sat Sep 21, 2019 5:53 pm

Sounds like it is getting the full 12v. I'm not that familiar with +2 wiring but isn't there an instrument
voltage regulator on the back of the dash? That knocks it down to 10v, where it should work normally.
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PostPost by: billwill » Sat Sep 21, 2019 6:18 pm

Dunno what the rear window switch is involved there for. It doesn't make a lot of sense.

Does the sensor have a type number? That would enable me to find out how it is supposed to work.
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PostPost by: billwill » Sat Sep 21, 2019 6:26 pm

This seems to be the basic circuit configuration of an electric pressure sensor.
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PostPost by: nwbaxter66 » Sat Sep 21, 2019 7:02 pm

Most helpful thank you.
I found an old sensor from one of my MGs, plugged it in and it worked - so it must have been the wrong sender.
Problem solved ... onto the clock !
Thanks
N
Nick Baxter
1970 Plus 2S (Federal)
1969 Plus 2 (UK) - sold
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PostPost by: JonB » Sun Sep 22, 2019 7:44 am

Kienzle is it? Have fun!

:lol:

This might help you: viewtopic.php?f=4&t=45119
Late 1972 Elan Plus 2S 130/5 - UK - Unit 50/1115L
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PostPost by: nwbaxter66 » Sun Sep 22, 2019 9:53 am

Debating the purpose of actually keeping it, its a Smith’s unit with the adjusting done through a cable that screws on the back, but that is missing, so we may have to back to the drawing board.
Replacing it with a voltmeter or a fuel pressure gauge might be more useful but non-original - not that originality is that critical right now

(:
Nick Baxter
1970 Plus 2S (Federal)
1969 Plus 2 (UK) - sold
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