I have an 02 F-250 7.3l extracab which I purchased from the first owner apx. one year ago. I am very happy with the truck, it's a great hauler and super comfortable for long trips.
One small issue, which I fear is becoming a big issue, is some curious faults in the electrical system. Since I bought the truck I noticed the radio would occasionally not work, this might happen at initial key-up or at some point down the road. Often it would come back on after a random period of time and sometimes it would not. If the headlights are on the radio will display the clock. This is not a huge deal for me in and of itself, I can live without the radio, but when the radio cuts out the power windows are also non-op.
Is there a relay or other point in the harness where these two circuts are common?
So these two ckts failing are a nuisance but not mission critical. Yesterday the stakes got higher and nearly required a cab ride home. I put the key in the ignition and paused while the fuel pump primed, as I recall the radio worked at this point, when I turned the key to crank the engine I heard a faint "pop" from the fuse panel and discovered a blown 30amp fuse at the "starter motor" position (103, I think). I robbed a fuse from another non-essential ckt, took a quick look at the starter motor to make sure everything was tight and right, then tried again. Two fuses down. I replaced the fuse again, turned the key to "start" and was pondering the situation for a bit when the radio suddenly came on (I hadn't realized it was off) and I thought; hmm, maybe... sure enough it cranked and started.
I guess now I'm looking for a place where all three (radio, power windows, and starter motor) circuits are common, right?
If I need to wring out the harness do I have a resource for routing, color coding and test points?
Thanks in advance