16 gauge red / white is the 12 volts coming in. This wire is common to both relays, (see next paragraph).
16 gauge dark green / orange is the switched 12 volts going to the coil pack, injectors, oxygen sensor heaters, and alternator field. There is indeed a separate fuel pump relay.
14 gauge dark blue wires feed the coils of both relays. They come from a terminal on the ignition switch and would be a good point to monitor with a test light or voltmeter. The ignition switches have caused a lot of problems from burned contacts and overheated connector pins / melted connectors but the circuit most affected has to do with the power windows, radio, and heater fan. People who use the heater fan on the highest speed very often have the most trouble with ignition switches. Usually the engine computer isn't affected.
20 gauge dark blue / yellow is the ground wire for both relay coils. It is grounded by the engine computer at pin 51 when the computer sees pulses from the cam and crank sensors.
16 gauge dark green / black is the switched 12 volts for the fuel pump relay.
You should have 4 relays on a metal bracket on the left inner fender. Starting from the front, they are the fuel pump relay, a mounting bolt, the starter relay, ASD relay, radiator fan relay, then the rear mounting bolt.
Monday, January 3rd, 2011 AT 12:24 AM