Ignition light issue

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Terry H
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Ignition light issue

Post by Terry H » Thu Sep 13, 2018 3:50 pm

Hi All,
I have fitted a new alternator and have a problem with the ignition light. I turn ignition on and the only lights on the cluster are the two brake lights. Engine starts and runs fine a charge of 13-14 volts showing on the gauge. I switch ignition off and the ignition light comes on and goes off. Switch ignition on again and ignition light is on along with both brake lights. Start engine and ignition light goes out as it should. Charge still 13-14 volts. Turn off ignition, no ignition light. Turn on again and no ignition light. I'm an electrical numpty and don't have a clue. Any help welcome, I wont be near the car until tomorrow morning.
Regards Terry H
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peter freeman
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Ignition light issue

Post by peter freeman » Thu Sep 13, 2018 5:07 pm

First suspect is the ignition switch - or your new alt is faulty.



Terry H
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Ignition light issue

Post by Terry H » Thu Sep 13, 2018 5:14 pm

Thanks Peter, I think I have an ignition switch hanging about somewhere, will see if swapping that works.
Regards Terry H
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scimjim
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Ignition light issue

Post by scimjim » Thu Sep 13, 2018 5:40 pm

Last thing you did presumably was have most of the dash off to change the wiper wheelboxes? If so, I’d suspect the wiring somewhere behind the dash, or the small brown/yellow wire from the alternator.


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Terry H
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Ignition light issue

Post by Terry H » Thu Sep 13, 2018 5:47 pm

Last thing you did presumably was have most of the dash off to change the wiper wheelboxes?
Thanks Jim, no just the glove box and air duct behind that.
I’d suspect the wiring somewhere behind the dash, or the small brown/yellow wire from the alternator.
Will check that tomorrow.
Regards Terry H
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Roger Pennington
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Ignition light issue

Post by Roger Pennington » Thu Sep 13, 2018 6:04 pm

Terry H wrote:
Thu Sep 13, 2018 3:50 pm
Hi All,
I have fitted a new alternator.....
If that's something you've just done, then you will have had to unplug and re-attach the alternator plug, if so you may have introduced a bad contact on the thin wire at the plug? (I had that problem recently)


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Terry H
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Ignition light issue

Post by Terry H » Thu Sep 13, 2018 6:18 pm

No plug Roger, three separate wires, one small one with a small spade and two thick ones with ring connectors. I assume the small one goes to the ignition light. I connected the new alternator up exactly the same as the old one was connected. The old one was on the car for at least 10 years.
Regards Terry H
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Roger Pennington
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Ignition light issue

Post by Roger Pennington » Thu Sep 13, 2018 7:01 pm

AFAIK the original alternator had a plug, so yours is probably non-standard - higher output? Whatever, whether it's a plug or separate wires makes no difference to the point I had in mind - the act of disconnecting/re-connecting the wires might have caused an intermittent fault in the thin wire or it's connector.


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Terry H
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Ignition light issue

Post by Terry H » Sat Sep 15, 2018 8:39 am

Just an update really. Went over the garage yesterday to have a look at the electrics and after fiddling about with the wires (I don't know what I did) it's now working as it should :? :? :? :roll: A big thank you to all those who gave suggestions. I'm even more confused now.
Regards Terry H
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Ignition light issue

Post by mark rudder » Sat Sep 15, 2018 8:53 am

Lucas Prince of Darkness, strikes again!
.…………& probably a bad connection.


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Current GTE 6B, Dolomite Sprint, Scirocco R. Past XJS (manual), V12 E-type (manual, convertible, lovely) 350 chev XJ6, TR6, TR4, Sprite, Midget, local Ford V8s, others... There's a pattern here.….

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