This Circuit Control Board Replacement 36v 18A With AC Relay DPI Golf Cart Charger is for DPI Gen-III chargers with an AC Relay Control. Replaces PCB on chargers identified with 1-36C018-04 models 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.