Operational Analysis (Newer Units); Circuit Condition - Rest - Generac Power Systems GP Series Diagnostic And Repair Manual

Section 2 Engine DC Control System

Operational Analysis (Newer Units)

Circuit Condition - Rest

Battery voltage is supplied to components of the control
system from the unit battery via the red battery cable
connected to the contacts of the starter contactor (SC),
wire 13, a 10 Amp fuse (F1), and wire 15.
Wire 13 is unfused battery supply voltage and is
connected to the contacts of the starter contactor relay
(SCR).
Wire 15 is 12 VDC fused battery supply voltage to the
SCR. DC voltage flows through the SCR coil and exits
the coil as wire 17. Wire 17 is connected to the start-run-
stop switch (SW1) and is held OPEN to ground. Current
does not flow through the circuit and the SCR is de-
energized.
Wire 15 is 12 VDC fused battery voltage supplied to the
SW1 and is held open to wire 167.
Wire 15 is 12 VDC fused battery voltage to the start stop
relay (SSR). DC voltage flows through the SSR coil and
exits as wire 229. Wire 229 will be 12 VDC held OPEN
from ground by the printed circuit board. Current does not
flow through the circuit and the SSR is de-energized.
18
Wire 15 is 12 VDC fused battery supply voltage supplied
to the normally open contacts of the SSR. One set of
normally open contacts are connected to wire 15B, the
other set of normally open contacts are connected to wire
14. The SSR is de-energized and no voltage is available
through the contacts.
Wire 15 is 12 VDC fused battery supply voltage supplied
to the battery charge rectifier 2 (BCR2). This is a return
current path for battery charging. No current flows at this
time.
Wire 18 connects to the ignition magnetos and to the
normally closed contacts of the SSR. The normally
closed contacts are also connected to wire 0 (frame
ground).
The SSR is de-energized and the magnetos are
grounded out at this time. No spark is available.
Diagnostic Repair Manual