simonjrwinter Posted June 17, 2019 Report Share Posted June 17, 2019 Just took my Tacho out and hanging in amongst the wiring is a bulb and holder with a white and white/brown tracer wire coming out of it. It looks like it should be in the back of the tacho. It’s not the charge light (that goes out when the engine starts and revs as it should) but this one just stays on all the time the ignition is on and it’s earthed. Oil pressure fine so it’s not an oil pressure light (don’t seem to have one of those) lights not on so it’s not an instrument illumination bulb. its been shining up there on its own for the 10 years I’ve owned the car so I’m not hugely worried, just wondered what the wire above is.... Simon Quote Link to post Share on other sites
Kevo_6 Posted June 17, 2019 Report Share Posted June 17, 2019 (edited) Hi Simon, I’ve just checked my wiring diagram which I made up for my car (72 CP) and those are the colour cables for the low oil pressure switch. Edited June 17, 2019 by Kevo_6 Quote Link to post Share on other sites
simonjrwinter Posted June 17, 2019 Author Report Share Posted June 17, 2019 (edited) Thank you.....hhhmmmm, guess I need to do some more in depth delving......possibly at t'other end of the white/brown wire...... Simon Edited June 17, 2019 by simonjrwinter Quote Link to post Share on other sites
Kevo_6 Posted June 17, 2019 Report Share Posted June 17, 2019 (edited) If you remove the cable from the oil pressure switch the light should go out, then put it to a good ground it should come back on, if this is the case you probably just need to replace the oil pressure switch. If the light stays on when you remove it the you have probably got a short to ground on the white/brown cable. Edited June 17, 2019 by Kevo_6 Quote Link to post Share on other sites
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