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These diagrams should help in your troubleshooting. The spark plug is grounded via the shielding of the plug/wire harness and can be checked by holding it in the air. The gap should be 1/10 of an inch. Wire #55 supplies power to both the pump and the igniter unit. When turned on, the igniter...

The flame heater can be tested in the open as shown below. The spark plug produces a "continuous" spark as long as the switch is held in the "on" position. The driver is a vibrator type, relying on capacitor, a coil and a relay for proper operation.

Yes, cranking speed is important to build up heat, should be 200 to 300 rpm...