I was recently working on my 2005 f 350. I don't drive it much and it sits on the ranch for weeks at a time. Anyways I started it up after charging the batteries. fired right up. Checking the fluids and such when my wife comes out and tells me we have an emergency at home. So I shut it off closed the barn and we headed home.
A week later I come back and it won't start. Much to my dismay I realized I had left it on a slow charge for a week. Took the batteries to Oreilly's and they were both fried. I bought new batteries and it still doesn't Crank. I can get the starter to crank with a remote switch but the ignition terminal on the solenoid is dead even with the key in the crank position.
What do I need to look for that might be burned out or any other ideas you may have?

 

1st off get a battery maintainer instead of what you have and leave it on there when not using it for extended times. Do you have an alarm? remote start? Disconnect the batteries and reconnect and try...Seems really weird that no crank signal to solenoid.

 

The starter relay is in the central junction box..fuse f2.31 is power to the relay hot in start from key.. The pcm grounds the relay..

 

this is a very basic truck. Standard transmission, plain bench seats, am/fm radio.
A friend told me to disconnect the batteries for 20 minutes then turn the ignition on and off 3 times to reset the computer... that didn't help either. One thing I noticed is when I turn the key to the start position I hear a single click which sounds like it is coming from the fuse box

 

This is for a 2005 seems there is no longer a solenoid on passenger firewall.

 

 

still can't get it to crank, checked all the fuses and the replaced the starter relay, nothing. I turn the key and the starter relay will click once. I have noticed that the start solenoid will click one time too, I figured maybe the single click was the solenoid engaging. any ideas?

 

Does it spin off the bypass wire?

 

batteries dead? see if you have juice down at the starter small wire with key to start.

 

Sure sounds like dead batteries or poor connection. Do you have headlights?

 

I'm starting to think a bad connection somewhere

 

Basic troubleshooting 101. Good grounds and positives. Verify all battery wires are clean and tight on both ends, even the smaller 10 gauge wires that attach to the inner fenders under the hood. Check the cables for low resistance. A cable end can look good and be hiding corrosion under the terminal or insulation. Pull the starter and bench test it.
Is this truck gas or Diesel?

 

^^^^ THIS ^^^^
Interior dome light(s)?
What is your battery voltage (got a meter?)