pinky Posted July 29, 2008 Report Share Posted July 29, 2008 hi after returning from malvern i have noticed the ignition light staying on when the ignition is switched of, when applying the lights the amp meter does not move only when you turn the car over then the amp meter shows a discharge any ideas before i start trowing bits away pinky Quote Link to post Share on other sites
harrytr5 Posted July 29, 2008 Report Share Posted July 29, 2008 Looks like the alternator is suspect. Regards Harry TR5 Nutter. Quote Link to post Share on other sites
Alpha206 Posted July 29, 2008 Report Share Posted July 29, 2008 I had the same symptoms a couple of years back and was convinced it wasn't the alternator. I was wrong. Quote Link to post Share on other sites
smizgals Posted July 29, 2008 Report Share Posted July 29, 2008 hi after returning from malvern i have noticed the ignition light staying on when the ignition is switched of, when applying the lights the amp meter does not move only when you turn the car over then the amp meter shows a discharge any ideas before i start trowing bits away pinky Pinky, I had similar problem after installing a MSD electronic ignition which will run on very low voltage. That leaked to this unit via the ignition lamp and so the engine could not be turned off with the ignition key. Solution provide in the installation kit was a diode fitted between the lamp and its power lead. Stan Quote Link to post Share on other sites
pinky Posted July 29, 2008 Author Report Share Posted July 29, 2008 Pinky, I had similar problem after installing a MSD electronic ignition which will run on very low voltage. That leaked to this unit via the ignition lamp and so the engine could not be turned off with the ignition key. Solution provide in the installation kit was a diode fitted between the lamp and its power lead. Stan hi Stan, i can turn the engine of no prob in fact every thing is working fine just the symptoms pinky Quote Link to post Share on other sites
Jersey Royal Posted July 29, 2008 Report Share Posted July 29, 2008 (edited) hi Stan, i can turn the engine of no prob in fact every thing is working fine just the symptoms pinky Pinky Have you checked the alternator is charging, ie voltage across the battery when running should be 13..14.5 volts, check also all connections into the alternator are intact and ok. Also check battery with engine off and water level. Cheers Guy Also member of the Numpty TB s Edited July 29, 2008 by Jersey Royal Quote Link to post Share on other sites
smizgals Posted July 30, 2008 Report Share Posted July 30, 2008 hi Stan, i can turn the engine of no prob in fact every thing is working fine just the symptoms pinky Pinky, I just remembered that I also accidentally shorted the spare connector on the back of the ignition switch and it was then that my symptom started. Must have damaged the ignition switch! Stan Quote Link to post Share on other sites
tr-idr Posted July 30, 2008 Report Share Posted July 30, 2008 hi after returning from malvern i have noticed the ignition light staying on when the ignition is switched of, when applying the lights the amp meter does not move only when you turn the car over then the amp meter shows a discharge any ideas before i start trowing bits away pinky Hi Writing this away from my workshop manual - but I'm sure back in the 80's I had the same problem - with a Lucas ACR15 alternator. In that there is a full wave rectifier (6 diodes) that generate the DC to actually charge the battery, and a separate half-wave rectifier (3 diodes in a single 4 pin package) that is used for the ignition warning light. I'd guess when you say the car works fine, the main diodes are OK. But one of the diodes in the half wave rectifier will have failed meaning that the battery is finding a path through the ignition warning light and the field windings back to the negative battery terminal. All you need is a new diode module which I recall wasn't very difficult to fit. Cost me a couple of quid back then from an auto electricians. Quote Link to post Share on other sites
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