Combustion Air Blower¶
to glow-spark plug
to thermo switch terminal C
to contact breaker
Disconnect cables from terminal 15 and from terminal 1 of ignition coil.
Attach intermediate cables to ignition coil terminal and to appropriate cables disconnected from coil.
Connect tachometer (see illustration) and turn heater on.
At the working voltage of 12 Volts, speed should be between 6400 and 7100 rpm. If speed deviates considerably, remove combustion air blower and test it.