Re: testing ignition coil on ea/eb/ed etc
OK the best way to test the coil is in situ by:
a) Buying a noid light (Super Cheap Repco etc usually used to test fuel injectors) and plug it into the low tension connection that normally plugs into the coils see if it flashes when you turn the engine over.
b) Put a spark plug with 6mm gap into the high tension lead that goes from the coil to the distributor and see if it has a bright spark when you turn the engine over.
These test are better than off engine tests. You can check the primary and secondary resistance of the coil off engine (0.41 to 0.45 ohms and 7.12 to 7.87 ohms respectivly) but I have seen bad coils test with good resistances but fail the foregoing on engine tests.