This Circuit Control Board Replacement 48v 17A with AC Relay DPI Golf Cart Charger is for DPI Gen-III chargers, Yamaha 72PCB models with an AC Relay Control. Replaces PCB on chargers identified with 1R-48C018EXX-XX model numbers that use an AC relay on the AC input wires. Charge mode preset to Trojan battery types. Assembled to heat sink for easy installation. This assembly comes complete with PCB, heat sink, and screws. One-year warranty from date of shipment. PLEASE READ AND FOLLOW ALL INSTALLATION INSTRUCTIONS!