HOW THE BLACKROCK® APUs CONNECT TO YOUR TRUCK BLACKROCK® APUs are self-contained auxiliary power unit systems. By requiring only minimal connections to the main engine’s system we protect your investment and your truck’s warranty. Installing BLACKROCK® APUs only require the following very minimal modifications: The BLACKROCK® APU connects to your fuel tank via separate fuel pick up and return lines. BLACKROCK® is connected to the truck’s main batteries for APU startup and charging the truck main battery packs All BLACKROCK® APUs are built to operate independently and each APU has its own: Self-contained coolant and A/C condenser system with the following features: condenser is mounted inside of the APU, it is NOT mounted on the back wall of the sleeper cab as other units are; radiator and dual electric radiator fans are contained within the APU for cooling in extreme heat; BLACKROCK® APU does not share coolant with the truck’s main engine. Separate exhaust system which is ducted to the rear of the truck, preventing exhaust from entering the sleeper cab All hoses and A/C lines are preattached for ease and foolproof installation All BLACKROCK® APUs come standard with quick disconnect and keyed electrical cables for ease of service and to prevent installation errors