Vehicle & Technical > Discovery
ignition light won't go out
andygod:
Help
Ignition light won't go out when the keys are removed and alarm key fob won't set the alarm. Alarm can be set with the key and ignition light goes out when the engine is started. This happened to me many moons ago when the alternator was on its way out, hope it’s a simpler problem this time. Engine is very dirty (covered in dust and light mud) fan belt is slipping. I was in a lot of water and mud last weekend. Engine is a 3.5 V8, any ideas why the ignition light won't go out.
imspanners:
Hmmm, mud + water + alternator.....?
See where this is going?
Try disconnecting the B+ wire from the back of the alternator.
If the light goes out, there's the problem. You could try hosing the alternator down, but I think the Rectifier diodes have gone and allowing power to feed through the alternator back to the warning light.
Replacement alternator probably required.
ChrisW:
Andy,
Give us a shout if you need any help - sounds like alternator related, as suggested try cleaning it up and check the connections.
Had my alternator reconditioned at Vehicle Electrics in Acocks Green - same day service.
andygod:
--- Quote from: "imspanners" ---Hmmm, mud + water + alternator.....?
See where this is going?
Try disconnecting the B+ wire from the back of the alternator.
If the light goes out, there's the problem. You could try hosing the alternator down, but I think the Rectifier diodes have gone and allowing power to feed through the alternator back to the warning light.
Replacement alternator probably required.
--- End quote ---
Disconnected the B+ wire and the light went out, can the alternator be repaired or am I looking for a new or re conditioned unit.
ChrisW:
Your alternator could either be a 65, 72 or 85 amp rating.
Depending on the rating replacement rectifiers range from £10 for pattern parts to £50 for genuine.
I think I paid about £80 for mine to be reconditioned which included the diode pack, bearings, new rotor and brushes.
Part numbers for the rectifiers are
72amp - STC1605
85amp - STC986
65amp - RTC5671
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