I am working on a E60TLEOC for a friend and it has no spark on any cylinder, I did some testing with the factory service manual and the trigger did not ohm out correctly, after pulling the flywheel found the center magnet had come loose and damaged the trigger some, after replacing the flywheel with a used one and a new trigger assembly still no spark. Do I have to have a DVA to correctly check the rest of the system like the manual says or can it be done with a standard volt ohm meter?