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Checking the secondary winding is easy. Go to your highest resistance setting on your meter. Take one meter lead to the magneto plate & the other lead to the end of the spark plug wire. That will measure the resistance of the secondary winding. Also leave the lead on mag plate & test for resistance between the mag plate & the block of the powerhead.
Reason I suggest this test I had resistance between the two & had to add a bonding wire between the mag & block.
When building a mag for a 2 cylinder motor you have 2 complete magneto systems. Mine had a current reverse & the output from 1. coil was going into 2. points & turning them gold they got so hot. I had cleaned all mating surfaces with acetone & lightly lubed it. With a bonding wire problem was solved, easy start motor now. If you have very high resistance testing the coil you may have a blow-out where the coil arced from the winding to ground. This would cause a break in the winding only connected by a piece of carbon where a winding was there. Carbon is a material used to make resistors too.