Why is the procedure for checking the resistance of a waste spark ignition coil different from the procedure for checking other types of ignition coils?

The procedure for checking the resistance of a waste spark ignition coil differs because waste spark coils fire two cylinders simultaneously, using one coil for two spark plugs. This design requires measuring the resistance of the primary and secondary windings in a specific way to account for the dual spark plug system. Additionally, the resistance values may vary between the terminals due to the shared nature of the coil, necessitating a tailored approach to ensure accurate diagnostics. In contrast, other ignition coils typically service a single cylinder and have different resistance expectations and testing methods.