I can't seem to find my 3rd fuse box in my 2004 Suburban

SOURCE: 2004 Sebring -- Opening the under hood fuse box.

put cold water over them not hot

SOURCE: Fuse location for 2004 suburban

The fuel pump works when you crank the motor and after the motor started, have someone start the car at the same time go to the back and listen for the pump, is inside the fuel tank, but You can her if works or not, bzzzzz! noise, The pump has a Relay inside the engine compartment left side in most GM cars, is a plastic square box plugged in to fuse panel among many others that look the same, but on owners manual is a page that shows fuses and Relays

SOURCE: Can not find 2000 Chevy Cavalier Flasher Unit

the relay unit is under the dash near the steering wheel should be connected to the searing shaft it looks like a small square green or black the relay is about 35$

SOURCE: 2004 Nissan maxima fuse box diagram

2004 Nissan Maxima - Trunk will not open, tried using the key fob - nothing, tried the lever on drivers door, nothing - still won't open.

SOURCE: Dash lights are not working 1999 Mercedes-Benz CLK

most probable cause could be a faulty ignition switch. Does the lights on the dash come on when you turn the key to the on position ? Do they turn off when you turn the car to the start and are about to crank the engine ? If that does not happen you will have to replace the Ignition switch. They don't have a fuse for the dash lights.