GENERAL INTRODUCTION EXPLANATION OF CX SERIES Electrical System All models have a 24-volt starting and charging system. The CX Series Excavators have two 12-volt batteries, wired in series to obtain the 24-volt capacity. These batteries are located in the compartment behind the cab. There is a battery relay connected between the positive battery cable and the machine electrical system. The battery relay acts as the master disconnect for the system. The battery relay closes as the key switch is turned to the "on" position. 1 - 10 CX EXCAVATORS