Part Number 686696089088 Alternator Overview This 12 volt alternator delivers 105 amps of charging capacity in a dropin style unit designed for direct replacement of part 240819B1. It uses a J180 mount and a negative polarity electrical system, with an internal regulator and an external cooling fan for stable operation under load. Key benefits Reliable power for demanding electrical systems: 105 amp output supports lights, accessories, and batteries under heavy use. Simplified installation: J180 mount and B+ terminal 1/428 allow straightforward mechanical and electrical connections for many common applications. Stable voltage regulation: Internal regulator removes the need for a separate external regulator and reduces wiring complexity. Improved cooling and longevity: External fan provides active airflow across the alternator to help control operating temperature. Direct replacement fit: Designed as a compatible replacement for part 240819B1 to reduce downtime and installation guesswork. Specifications Part number: 686696089088 Item description: Alternator Voltage: 12 volt Amperage: 105 amp Mount: J180 Polarity: Negative Regulator: Internal B plus terminal: 1/428 Cooling: External fan Replaces: 240819B1 Weight: 27.36 lbs 12.44 kg; weight 28 lbs Applications and scenarios Fleet vehicle maintenance: a worn alternator on a delivery truck to restore reliable charging for multiple onboard accessories and prevent battery failures during routes. Agricultural or construction equipment: Install as a direct replacement alternator on machines that use a J180 mount and negative ground electrical systems to maintain consistent power to lights and controls. Emergency or backup vehicles: Use the 105 amp output to support electrical loads from communication equipment, lights, and auxiliary systems during extended operation. What to check before ordering Confirm the J180 mount and B plus terminal 1/428 match the vehicle or equipment connection points. Verify negative polarity and 12 volt system compatibility. Cross reference the old part number 240819B1 if replacing an existing unit. This alternator provides a practical, specificationmatched replacement option for 12 volt systems that require 105 amps, a J180 mount, internal regulation, and external fan cooling.