Fuel Gage

Voltage to the Fuel Gage is supplied through the PNK/BLK (39) wire with the Ignition Switch in START or RUN. The movement of the Fuel Gage needle is controlled by current flowing through two coils in the gage. This movement creates magnetic fields in the coils. The amount of current flowing through each coil is controlled by the Fuel Tank Sender unit. Voltage from the PNK/BLK (39) wire is applied to one end of the EMPTY (E) coil. The other end of the E-coil is connected to the FULL (F) coil, BLK (151) wire, Fuel Tank Sender and PNK (30) wire.

When the Fuel Tank is empty the resistance of the Fuel Tank Sender is low (one ohm). This allows more current to flow through the E-coil and the Sender resistor, and the magnetic field in the E-coil pulls the pointer toward E on the Fuel Gage.

When the Fuel Tank is Full, the resistance of the Fuel Tank Sender is high (88 ohms). This allows more current to flow through the F-coil to ground through the BLK (150) wire, and the magnetic field in the F-coil pulls the pointer toward F on the Fuel Gage.