Ignition light

[paz7330]

Hi! I wander if someone can help, I noticed today that the red ignition light did not go off when I started the engine, if I really rev the engine it then goes off and stays off, but if I then turn it off and satrt up the light stays on, do I take it that my alternator is f****d, thanks Tim

[V8 Animal]

No.
I would look at the 100 amp fuse before you go and buy a alternater.

[Chimjunkie]

And that may be mounted on chassis behind drivers front wheel just forward of starter motor. Have heard of a test suggested (may have been CliveF?) Think you measure voltage between +ve on battery and main +ve on alternator. If there is 0v then all is well. Otherwise fuse gone.

[paz7330]

Thanks for the advice, i will check tomorrow, I imagine its obvious if its blown

[GreenV8S]

Is the no-charge warning light an LED on your car?

The alternator needs a small current to be applied to kick it into life, and conventionally that current is provided by the no-charge warning light. The lower the current the more revs you'll need to get the alternator to start up. If you don't provide any current at all it may still be possible to get it started using residual magnetism with lots and lots of revs.

On some TVRs the no-charge warning light is an LED instead of a bulb, and this doesn't pass enough current to actually kick start the alternator. On these cars I'd expect to find a resistive bypass across the LED that's just there to get the alternator started. If this sounds like your setup, perhaps that bypass has failed.

[paz7330]

So would that mean that the alternator may be working?

[joncon]

if you do need a new alternator, i just had one from these guys.....www.universal-rotating.co.uk.
100 amp alernator , £121.94 delivered. came within 48 hrs .
part no. una801

Edited by joncon on Tuesday 4th November 21:42

Edited by joncon on Tuesday 4th November 21:43

Edited by joncon on Tuesday 4th November 21:43

[paz7330]

Cheers tahnks for that

[joncon]

had to edit 3 times and still didnt spell alternator correctly........
getting old....
found them on ebay, but bought it over he phone.

[V8 Animal]

Or the

[daz the plumber]

my light is on all the time even when the ignition is off but its charging as it should , if i disconnect the alternator it goes brighter .i wonder what that is .

[Chimjunkie]

daz the plumber said:

my light is on all the time even when the ignition is off but its charging as it should , if i disconnect the alternator it goes brighter .i wonder what that is .

Just another one of your many woes Daz

[spend]

Poltergeist needs changing?

[JonathanT]

paz7330 said:

Thanks for the advice, i will check tomorrow, I imagine its obvious if its blown

I have the same problem with my chim where the 100A fuse seems to last no more than 2-3years before mechanically failing (presumably due to stress). I get it changed each year now.

[spend]

Somebody did advertise recently the midi fuse & holders as a replacement, which are certainly a better quality than the the cheap strip fuse & holder commonly used. I would give those a try in your situation, and possibly a bit of heat shield between the manifolds & fuse holder.

[paz7330]

Thanks for all the help, it was the fuse, garaged replaced it for free, so glad I didn't have to fork out for an alternator

[V8 Animal]

paz7330 said:

Thanks for all the help, it was the fuse, garaged replaced it for free, so glad I didn't have to fork out for an alternator