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Starting and Stopping the Enginetemperatures, and be clearly markedSuitable for Use with OutdoorAppliances. Do not use an indoorextension cord outdoors. This couldresult in an electric shock or become afire hazard.• Use as short an extension cord aspossible.• Do not use multiple extension cords.• Make sure that when in operation, theextension cord plug and heater cordplug connections are free and clear ofwater. This could cause an electricshock or fire.• Make sure your vehicle is parked in aclean area, clear of combustibles.• Make sure the heater, heater cord andextension cord are firmly connected.• Check for heat anywhere in theelectrical hookup once the system hasbeen operating for approximately 30minutes.• Make sure the system is unplugged andproperly stowed before driving yourvehicle. Make sure the protective coverseals the prongs of the block heatercord plug when not in use.• Make sure the heater system ischecked for proper operation beforewinter.Using the Engine Block HeaterMake sure the receptacle terminals areclean and dry prior to use. Clean them witha dry cloth if necessary.The heater uses 0.4 to 1.0 kilowatt-hoursof energy per hour of use. The system doesnot have a thermostat. It achievesmaximum temperature afterapproximately three hours of operation.Using the heater longer than three hoursdoes not improve system performance andunnecessarily uses electricity.138F150 (TF6) , enUSA