Last week I washed my 95 6.5 TD. After washing, I started the truck, turned it around and parked it in the driveway. THe next day I wanted to put it in the garage while I went up north for the weekend. It would not start. Glow plugs light came on like normal and went out when it was ready to crank and heard the glow plugs click off like normal. Upon turning the key it sounded like the solenoid was firing and then there was a brrrr sound that deminished over a few seconds time frame. I have tried everything from checking fuses to cables. I bridged the starter from the ignition pole to the power pole and got the same sound. I checked the power in both batteries and they are around 12.8 volts as well as checked continuity from each battery lead through to the starter and to the engine as ground. I cleaned the terminals and corrosion at the cable ends. I replaced the starter even though I found later that the origonal was good so I have to rule out that either starter is the culprit. I rotated the engine at the crank pulley so I know that the engine hasn't ceased. I am so gal darn stumped. I can usually figure out things like nothing but I'm about to be completely bald from the head scratching. PLEASE HELP!

 

Double check the cable going to the starter. I bet it's corroded enough inside to cause a major voltage loss.

 

Or the batteries are bad. Load test them and see what happens.

 

^^ What he said. Voltage drop the cable to the starter from the battery during cranking. You should have no more than .02 volts across the cable.

 

Any updates??