There are two important numbers associated with the Cushman vehicles. One is the MODEL number and the other is the SERIAL number. On the golf cars they are located in different places. Usually the Model Number is found under the seat to the driver side of the shift lever console. The number is stamped into a plate riveted to the console and the number usually starts with an '8', like 898100 or 880429. This number is most important because of all the different models Cushman made. Many were very similar in look but the wiring schematics differed. 
The serial number is commonly found stamped into the metal side rail, just below the floorboard on the driver side. Rust or several coats of paint may obscure the 6 digit number. It is not as important as the model number but it helps to have it on hand, especially for the non-golf car vehicles. The 'Meter Maids' and turf 'Trucksters', as they were called, may have the serial and model number on the dash console near the emergency brake pedal.