Clarke MA50 15B, Service Manual, Page: 18 / 87

Electrical System
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Service Manual – MA50 15B
Electrical System
Functional Description
The electrical system consists of a switch panel, and a control PCB to operate the vacuum and brush motors and
solution solenoid. There are also (2) circuit breakers which are used to protect the vacuum and brush motor from
excessive current.
The battery charger is an “on board” style charger which is 24 volts DC, and has an output of 5 amps maximum.
The electrical system is powered by (2) 12-volt batteries for a total of 24 volts. Heavy wires connect the batteries
in series. The battery charger has an interlock to prevent charging when the machine is powered up. There is no
need to dis-connect the batteries for charging.
The control system will turn off the scrub system and recovery systems if the battery voltage drops too low to
prevent damage to the batteries due to excessive discharging.
The machine wiring is color coded, and the wires are marked with yellow numbered bands corresponding to their
location on the Wiring Harness Diagram.