Bit of an update, checked a few voltages: -ve side of coil: 0v ignition off,12.3 v ignition on, drops to 9v when starter engaged-I would have thought it should go to 0volts?
You're on the right track. It should alternate between + 9 to 12V and 0V as the points or Pertronix switch it between open and ground. The fact that you aren't seeing a square wave signal suggests that the Pertronix isn't working.
+ve side of coil:again, 0volts, 12.3 volts then 9v.
Nothing wrong there.
what else can I check before I ask for Pertronix ignitor to be replaced?
A quickee check would be to:
- Unplug the Pertronix lead from the coil "-" terminal
- Put a timing light on the coil-to-distributor high voltage lead
- Alternately short the coil "-" terminal between ground and open.
You should see the timing light flash every time you break the connection to ground. That would indicate that the coil is OK.
Another check would be to reinstall your points & condenser and verify that the car runs OK (no doubt it will).
Are you sure your coil's resistance is appropriate for the Pertronix? It may have fried because the coil has too low a resistance and draws more current than the Pertronix could handle.
Or as Nakagtv wrote, the Pertronix your received may simply have been defective. I had a similar experience with a Pertronix knock-off product called the "Hot Spark".