Electronic Charge Controller 12V For MZ ETZ 125 150 250 251 301 TS ES5 Pin Electronic Charge Controller 12V Fit for MZ ETZ 125 150 250 251 301 TS ES Features: 12 volt electronic replacement regulator for the original factory installed mechanical voltage regulator. in a 4 pin (51 D+ 51 DF) configuration and a side ground pin. The connections are marked in the same way on the mechanical regulator. The electronic components are housed in a die cast aluminum housing and encapsulated in synthetic resin. Supplied without