Just finished the "The Timing Job" on my 2004 F150 5.4 3v and I connected the battery to it. I noticed there when I opened the door that there no map lights or odometer lights on. Also, my theft light wasn't blinking like it would usually blink. When I put the key in, there was no dinging sound and nothing came on. battery and alternator are new. I put a multimeter on the battery and it read 12.6. Checked some of the relays and fuses and they looked fine. Not sure where to go at this point.

 

Check the fusible links. There are three I believe; one from the battery to the fuse panel, one from the battery to alternator, and one from the battery to starter motor. They are large gauge wire that are designed to burn internally, opening a circuit when too much amperage is drawn. These three circuits are unfused, hence the reason for using these fusible links.

 

Figured the lack of power problem...forgot about a second cable that leads towards the pcm that went on the positive(Rookie move). When i try to crank it there is a click at the fuse box at the pcm(relay 203) and relay r03. i made a video to show it. The Crankshaft sensor is disconnected and I switched othe relays to verify that it wasn't a bad relay. I also checked to verify that the solenoid wasn't bad.

 

Figured it out. Turns out it was in gear underneath the truck. Once I set it back in park, it started up with no problems.