Electrical tell tale system for trailers

An electrical tell tale system for trailers that consists of a unique tell tale monitor which is light weight which houses different colored light emitting diodes which define each individual trailer circuit. The tell tale monitor has an attached modular cable and modular plug which is connected by a modular socket to the main control unit. The main control unit has two protruding leads which are connected in series with the vehicles trailer wiring harness by connectors. The system works by scanning the trailer signals passing through the main control unit and specially set, wound resistive current sensing coils, which close a reed switch at the correct current which in turn sends a low voltage signal through the modular connection and through the modular cable to the tell tale monitor which will illuminate a certain light emitting diode to notify if the trailer circuit is operational. If the trailer circuit passing through the main control unit is in-operational, the unit on the tell tale monitor will not light, indicating a fault. If a wrong globe is installed for a particular trailer circuit the light emitting diode on the monitor will flash, also indicating a fault The system is tested by unique current and voltage testing tools.