6 Owner’s Manual
Wanco® Metro™ Message Sign
2.4 Service safety
■ Always take precautions to ensure the safety of service personnel. Whenever possible,
perform maintenance indoors, out of the weather and away from traffic.
■ Never perform any service unless all electrical components are shut down. Ensure all
message sign power circuits are shut off.
■ Always disconnect power cable from computer box before disconnecting battery
cables. The computer box is located inside the battery box.
■ If disconnecting message sign battery cables, always disconnect the positive (+) cable
first.* Do not allow positive power cable to short to ground.
■ If the ground under or around the trailer is damp or wet, move the trailer to a dry
location and allow it to dry before servicing.
■ Do not service the message sign if your clothing or skin is wet.
■ Always be aware of traffic when performing roadside maintenance.
■ Keep the message sign and all its components clean.
WARNING
Fire hazard.
When working with the message sign batteries, never
allow positive wiring to short to ground.
CAUTION
Adverse weather conditions can cause equipment
damage and injury.
Whenever possible, perform maintenance indoors or in
calm, dry weather.
CAUTION
Voltage surge could damage control circuits.
Before servicing electrical components, disconnect power
cable from computer box.
*Removing the positive cable first is a requirement for negative-ground systems.
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