i have an 08 F250 turbo diesel that wont crank over. I checked the batteries, start relay, power is good. the ignition switch appears to be working correctly. starter fires out when hooked up off vehicle. any suggestions?

 

weak batteries. Replace both. Check the starting circuit while cranking (or attempting to) in this case.

Check fuses first.

 

batteries are new 12.4 in each, checked fuses in fuse boxes under hood and passenger foot area, start relay clicking as is passenger side dash area.
When you turn key no power to solenoid bolt on starter, maybe another fuse in line or a switch somewhere?

 

is there a theft light flashing on the dash? first thing i would do is try another key

 

i tried other key, disconnected batteries for over an hour. just frustrated. truck is stock with 41k on it.

 

does sound like an anti theft issue.

 

if the theft light does shut off it could be the Exhaust Gas Temperature (EGT) Sensor #3 if you can Unplug the sensor, check the resistance of the sensor, if it is open circuit, replace that sensor.

 

If it were the sensor after a cool down it should start.

 

ill try it over the weekend, ill try anything if you have any other suggestions. if not it gets towed to the shop monday

 

see this:

1. Parking brake SET <o></o>
2. Key in the ON position <o></o>
3. Open hood <o></o>
4. Near the RH battery, there is a single wire disconnect. It is attached to the battery box. Remove it from the battery box and disconnect it. <o></o>
5. Touch the end headed towards the starter to the POSITIVE terminal of the battery. <o></o>

The truck should start. Reconnect the wire, close the hood, andcheck for codes. You will likely have a code for EGT-13 open circuit, overtemp, out of range.

DISCLAIMER: USE THIS INFORMATION AT YOUR OWN RISK. IF YOURVEHICLE IS INDEED EXPERIENCING AN OVER TEMPERATURE CONDITION THERE IS RISK OFVEHICLE DAMAGE AND POSSIBLE FIRE OR TOTAL LOSS OF VEHICLE. THE AUTHOR OF THISPOST ASSUMES NO RESPONSIBILITY FOR THE INFORMATION PROVIDED WITHIN. USE THEAFOREMENTIONED INFORMATION PROVIDED AT YOUR OWN RISK TO SELF, VEHICLE, ANDPROPERTY.<o></o>

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I would like to thank everybody who helped on this subject saved me some cash. The issue was the EGT #3 registering 1470 degrees. a $105 dealer part and 15 MIN install. Thanks Again