Alpha Technologies AlphaGen 5.0kW Auxiliary Power Unit - Manual (Page 25)

1. System Overview
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031-132-B0-001 Rev. A TM ©2000
1.8 Ignition Battery Charger Overview
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The Ignition Battery Charger keeps the Ignition Battery sufficiently charged
to start the Auxiliary Power Unit (APU) in the event of an extended power
outage. The ECM monitors Ignition Battery Voltage via the generator control
board. The ECM regulates the amount of charging and switches the battery
charger OFF to prevent overcharging the ignition battery. Charging is initated
when relay (K1) on the ECM board closes and connects pins 1 and 3 of the
Battery Charger Control Interface Connector, causing the charger to energize
and begin battery charging.
Fig. 1-9 Wiring for ECM, Ignition Battery Charger, and Ignition Battery