1976-1993 is called the Marathon. Look at the manufacturer's number located on a metal plate below the passenger side glove compartment. In the Manuf. Number there's a two digit year code hidden, ex. 86 is 1986.
1994-1995 is called the Medalist. Has a metal body. Year is determined by a two digit year code, ex. 95, hidden inside the Manuf. Number located on the metal plate inside the passenger side glove compartment.
1996-Current is the TXT. Has a plastic body. Year is determined by a two digit year code, ex. 99, hidden in the Manuf. Number located on the metal plate inside the passenger side glove compartment. Electric TXT's come in normal, DCS (Drive Control System) and PDS models.
In 2001.5 and newer EZGo changed the steering mechanism. Some 2001's have the old style, some 2001's have the new. The newer (2001.5+) has a steering rack that lays on top of the front axle. The older style has a black arm that comes straight down from a silver steering box.
How to Determine the model of your Electric TXT:
Under the seat, on the passenger's side, there is a black plastic rectangular cover over the motor controller. If the cover does not have a switch on it (usually labeled Run/Tow) than it is a normal, "series" cart.
If you have a switch on the controller cover, you need to take the cover off with the four bolts holding it in place for further inspection. A DCS controller has a white 10-pin connector on the top. A PDS controller has two 5-pin connectors on the front. PDS carts can accept a chip that will make them go faster and/or drive differently. See a local EZ-Go dealer for this chip.