The John Deere AT61466 is a genuine OEM voltmeter designed for a wide range of agricultural and industrial machinery. This essential electrical component monitors the voltage of the machine's electrical system, ensuring optimal performance and preventing potential issues. It is compatible with numerous John Deere models including 4400, 6600, 7700 series combines, 9900 cotton pickers, 5440, 5460, 5720, 5730, 5820, 5830 forage harvesters, 2040S, 2140, 2250, 2450, 2650, 2650N, 2850, 3040, 3050, 3140, 3150, 3350, 3640, 3650, 4040, 4040S, 4050, 4055, 4240, 4240S, 4250, 4255, 4440, 4450, 4455, 4640, 4650, 4840, 4850, 8430, 8440, 8450, 8630, 8640, 8650 series tractors, and 2270, 2280, 2320, 2420 windrowers.