Section 2 Engine DC Control System
Diagnostic Repair Manual 13
With the start-run-stop switch (SW1) held in the START position, wire 15 is connected to wire 167. Wire 15 supplies
fused battery power via wire 167 to the printed circuit board. This 12 VDC input signals the printed circuit board to
internally ground wire 229 which is connected to the coil of the start stop relay (SSR). This action allows current to flow
and the SSR is energized. The normally open contacts close, supplying battery power from wire 15 to wire 14. Wire 14
supplies power to the fuel shutoff solenoid (FSS). It is energized and fuel is available to the engine. Wire 14 also
supplies power through resistor R1 and diode D1 to wire 4. Wire 4 connects to the field or the rotor assembly and is
used as field boost. The second set of normally open contacts on the SSR also close connecting wire 15 to wire 15B.
Wire 15B now supplies 12 VDC to the printed circuit board for use with the governor control system. The normally
closed contacts now open, wire 18 is no longer connected to wire 0 and the magnetos are no longer grounded out,
allowing voltage to flow to the spark plugs.
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