Looking at the '92 EVTM...
The Red wire should have battery voltage (12 VDC). It gets power via the ECC relay which energizes when the ignition is in RUN. Power comes from Fuse Link G (20 ga Dark Blue) to the ECC Relay and when the relay energizes power goes to the Red circuit. The EEC supplies the ground to the Fuel Pumpp relay via the LB/O wire.
How The Circuit Works
The Electronic Engine Control System uses an Electronic Engine Control (EEC) Module to control fuel flow, exhaust gas recirculation (EGR), ignition system functions, evaporative emission, idle speed, A/C cutout, engine cooling and air management.
Fuel injectors, mounted in the intake manifold at the intake port, meter the flow of fuel into the engine. The EEC Module fires the injectors.
Fuel is supplied to the engine by an in-tank Electric Fuel Pump. When the Ignition Switch is turned to the RUN position, voltage is applied to the Fuel Pump Relay Coil. The Coil is grounded by the EEC Module and the relay contacts close. Voltage is now applied to the Fuel Pump.
When the Fuel Pump Relay is grounded by the EEC Module and the Inertia Switch is closed, power is supplied to the Fuel Pump. Fuel flow is produced by the Fuel Pump, and fuel pressure is built up in the fuel delivery system. Fuel Pressure is controlled by a fuel pressure regulator.
NOTE :If the engine does not operate after a collision, it may be that the Inertia Switch has opened. To reset the switch, put your finger through the hole in front of the trunk trim line and push down on the plunger.
If you see or smell gasoline, do not reset the Inertia Switch.
'92 SSP (ex-FHP 797) stock - SOLD