I finally got everything sorted out with my alternator/ starting problems, So I thought. Today I was driving on the highway, and when I stopped the truck just shut down. I "wiggled" fuses and a DIODE in the power distribution box... When I wiggled the diode I heard relays clicking and the lights all came back on. I pulled the diode out. It looked pretty croded. I cleaned it up the best I could, then threw it back in and the truck started right back up.
Long story short.... What does this DIODE supply? It is located directly under the Fuel pump mini fuse. I would like to replace it.