Charge Warning Indicator

The charge warning lamp is identified by a battery symbol on the electronic instrument cluster. When a charging system malfunction occurs, circuit DA28 closes, and the charge warning lamp illuminates. The charge warning lamp also illuminates during prove out. When the ignition switch contacts are closed (switch turned to ON), battery current flows through the charge warning lamp to the voltage regulator and the lamp illuminates. When the ignition switch is turned to the START position, the generator supplies voltage to the voltage regulator, and the charge warning lamp goes out.

With the ignition switch in START or RUN, voltage is present at the CHARGE warning indicator through the Gray/Blue wire. When the engine is not running, or when the engine is running and the generator/voltage regulator output is below a preset value, the generator/voltage regulator grounds the CHARGE warning indicator bulb through the Yellow/Blue wire and the Yellow/Black wire causing the indicator to light.

At the same time, the Blue/Yellow wire is grounded by the generator/voltage regulator via the diode junction box. This grounds the bulb check relay coil. The relay is energized, applying ground to the Yellow/Purple wire also causing the brake warning indicator to light. If the engine is running and the charging system is working properly, the generator/voltage regulator removes ground from the Yellow/Blue and Yellow/Black wires and the diode junction box and the CHARGE warning and brake warning indicator turns off.