after fitting alternator ignition light stays on when engine switched off

Standard & electronic conversions
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jcrcleeman
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after fitting alternator ignition light stays on when engine switched off

Post by jcrcleeman »

I'm sure I read about someone having a similar problem before when I was reading up about fitting an alternator and retaining the original regulator box but I cant find the thread now!

I think it was sorted by putting an insulator (piece of card or similar) between the coil points in the regulator?

Obviously to make the ignition light come on when the ignition is off, it has to get 12v from somewhere and as the alternator is not turning (which is the other end of the thin yellow wire) it must be getting the supply from the regulator box. Why is that?

John.



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jcrcleeman
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Re: after fitting alternator ignition light stays on when engine switched off

Post by jcrcleeman »

Found two different wiring diagrams for the alternator conversion.

One shows the Regulator Box with the ignition light wire connected to "D" post and in the other diagram it's not connected to any terminals only the small signal lead from the alternator.

Tried the latter arrangement and it works fine.
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Custard
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Re: after fitting alternator ignition light stays on when engine switched off

Post by Custard »

Only just seen this.

In theory they are the same as the first is using the D terminal as a junction box joining the wire from the bulb to the wire from the alternator.

I have usually done it using the Lucas Diagram;

viewtopic.php?f=20&t=746&start=15

I think you can use the box as a junction and move the A and A1 wires to the same spade.

I remember the card too but not which thread it was.

I haven't looked at the control box internals, but it may also be that with the dynamo A and A1 can be reversed and everything still work Ok, but it then cause an issue when the Alternator is fitted.

Main thing is you found a way to have it working.

Sean.



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