Postby simmitc » Tue Feb 26, 2019 10:35 am
Your lack of power from the switch could also be a broken wire or poor connector. For testing purposes, you can bypass the feed from the ignition switch: simply remove the white wire form the IGN / +ve terminal on the coil and run a new clean piece of wire to the positive temrinal on the battery. Use a crocofile clip so that you can disconnect from the battery when not testing, but that will provide a good supply to the ignition system.
On the other side, once you have completed all steps in previous advice and have 12 volts at the dizzy end of the white and black lead, then you can (with enough hands and eyes) perform another test to prove the components up to that point. First think that points do: they open and close, breaking and making a circuit to earth. You can simulate that. Set the HT lead from the coil to the block as previously. Connect the ignition to the battery. Alternatiely touch and remove the free end of the white/black wire to a good earth point. Expect to see a spark where you do, but also there should be a spark from the HT lead. You now know that it all works to there and can fit points fully confident that it if does not then work, it has to be in the dizzy where the problem lies - and there are a few possibilities, but let's get everything good up to that poiont before worryinh about them, other than confirming that the vacuum advance is OK as that's a nice simple test.