Starter output. Connects to the vehicle’s starter wire; this is the wire that only shows 12V when the key is in the "start" position.
Set the remote start duration (typically 12, 24, or 60 minutes). Challenger Ch 1000 Owner Installation Manual
Without seeing the actual manual, I’d guess it’s for a UPS, power inverter, or industrial controller. Such manuals are fascinating essays on human-machine interaction —translating electrical engineering into plain language (or failing to). Starter output
Challenger Ch 1000 Owner Installation Manual Subtitle: Comprehensive Guide to Setup, Wiring, and Safety Applicability: Challenger Ch 1000 Electric Hoist / Winch Systems I’d guess it’s for a UPS