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Edit 7/10/17 : If the Ignition is OFF when you remove the thin wire from the alternator and connect it to +12V then yes the Ignition light will light as current can be fed in reverse through the bulb, through the low resistance of the coil and back down to earth through the points ( or any other electrics that are left switched on ).
Can you try the same thing please with the ignition ON and the thin wire IGN light connected to a good earth.
Tony.
Hi Peter, Its good that its sorted. Did you get a good result with the above test ?
The trouble with replacing alternator parts to get them working is that its like eating salted peanuts: you can never eat just one.
So after you have replaced brushes, regulators, diode packs, and find you have a faulty field coil, if you have several cars all with the same Lucas alternators you can save the good bits and put all the faulty bits back into one unit and service exchange that one
Yes, probably best to bite the bullet and get a new one.
Tony.