The Triumph Dolomite Club - Discussion Forum

The Number One Club for owners of Triumph's range of small saloons from the 1960s and 1970s.
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 Post subject: ign lite on when idling
PostPosted: Mon Jul 09, 2018 8:52 am 
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my 1500 thats not yet back on the road but hopefully will be soon, when idling the red ign lite stays on. what causes this please?


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PostPosted: Mon Jul 09, 2018 10:24 am 
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my 1500 thats not yet back on the road but hopefully will be soon, when idling the red ign lite stays on. what causes this please?
Low tick over or a slack fan belt? Roughly what RPM do you have at idle?
It could be the early signs of the rectifier diodes failing, but I'd start with the 0 cost options of idle speed and belt tightness.

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PostPosted: Mon Jul 09, 2018 11:56 am 
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PostPosted: Tue Jul 10, 2018 9:45 am 
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Or, like I once had on a sprint, a faulty connector to the alternator.

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PostPosted: Thu Jul 12, 2018 4:45 pm 
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Another vote for the connector to the alternator. Oddly enough I had the same symptoms with the addition of the light occasionally flickering at high revs.
I replaced mine with new one from AES spares.


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PostPosted: Thu Jul 12, 2018 5:52 pm 
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Another vote for the alternator connector. I obtained one from Moss as they have a branch in Bristol. It was a stock item.


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PostPosted: Thu Jul 12, 2018 8:55 pm 
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Word of advice though, unless I made heavy weather of it, it's a simple if fiddly and awkward job to do.
The cables going to the original connector were to short to cut and attach new female connectors to. I had to make short extension cables and solder them to the original ones.
Not difficult but a pain in the backside when leaning over the wings and soldering in the bowels of engine bay.
Oh and don't forget to disconnect/take out the battery! :shock:
I clearly had a bad day and got totally focussed on the cables. I remembered about the battery as one of the cables sparked against the engine block


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PostPosted: Fri Jul 13, 2018 9:34 am 
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Have you put a meter on the battery when the car is ticking over and at 2000 rpm. With a decent battery you should have around 12.8v on tick over and about 14v at 2000 rpm. Try this without and with a load (lights, fan, heated rear window and wipers on). It will give you an indication of the alternator output. The voltmeter in my car reads almost half a volt too high but is still a useful indication.


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