System, Check Function (Trailer Hitch)

Check functioning of system.

To check, connect trailer to vehicle.

When checking without trailer, connect a 5 watt light bulb to socket clamps "5/58R" and to "7/58L" and a 21 watt light bulb to terminals "1/L", "4/R", "2/54g" and "6/54". With 13-pin socket, connect in addition a 21 watt bulb to terminal 9.

When operating with trailer, the double telltale system is a closed system. The system will indicate non-functioning bulbs on vehicle or trailer. When operating without a trailer, only the vehicle telltales are of importance.