Generac Power Systems GP Series Diagnostic And Repair Manual page 15

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.
Diagnostic Repair Manual
Section 2 Engine DC Control System
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. Wire 0 is
frame ground.
The SSR is de-energized and the magnetos are
grounded out at this time. No spark is available.
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