You will need to replace with the correct voltage regulator. A straight cutout will toast your generator. Your generator is 3 brush field coil regulation. It requires a regulator that is an A circuit regulator. A proper regulator can be purchased from Steiner antique tractor parts for about $40. Part number is ABC-073. Once installed can be adjusted to provide proper voltage with headlights, etc. on. I struggled with my system for years until I finally got it right. Now works as it should. I went through several old regulators before I got it right.