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Ignition warning light problem

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Ignition warning light problem

Posted by martyn_hambling at June 15. 2017



I have a 74 850 Roadster.

The ignition warning light is staying on whilst running.

I have checked the alternator charging and it seems to be ok.i.e current going into the battery at different rates with load (lights) on and off.

Im thinking it may be the way Ning light assimilator at fault.

What is the test procedure to prove this?

i should add, prior to this (weeks before) I noticed that the warning light was not coming on immediately the ignition was switched on, which makes me think the assimalator was failing.

Any thoughts welcome.


Re: Ignition warning light problem

Posted by john_holmes at June 15. 2017

Don't know of any tests other than substituting with known working example but if its the original then its well past its use by date, not exactly long lasting. Go for a solid state alternative, Al Osborne does one and RGM.

Re: Ignition warning light problem

Posted by alan_blackhurst at Thursday 18:55

Is that the blue thing

Re: Ignition warning light problem

Posted by john_holmes at Thursday 19:12

No, that's the 2MC capacitor for battery less running, pre mk3 charging warning cans are silver/grey.

Re: Ignition warning light problem

Posted by james_fanning at Friday 08:37

Have a similar problem on my MK 3 850 with the red charge warning light sometimes not coming on when ignition switched on prior to starting - sometimes it does , sometimes it doesn't. When engine starts it always goes out however unless revs are at very low tickover when it just flickers a bit - blipping throttle puts it out again. Been like that for years and battery charging system has always been OK. I did once replace the assimilator (black thing on the MK 3) which cured the problem for a while but it has recently started playing up the same again. Fitting a new assimilator will likely cure your problem.

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