So I went to start my 2006 this morning and it would not crank at all. Like the battery was dead ( all the light in the cab and headlights were working fine. ) so I tried to jump it and still nothing no clicks not crank no nothing. Just for fun I went ahead and jumped the starter (using the same method as when I prime the hpo system) starter cranked no problem so I put the key in the on position and cranked the key again still nothing. So I put the key in the on position again and jumped the starter truck fired right up. So I went back in the cab and tried to start it with the key and it started right up like nothing ever was wrong. Does anybody have any ideas as to what was causing this? Also my voltage was at 11.5 with the key on and engine off when it was running the volts were at 12 to 12.5

 

I think it may be an icp issue. I got code p2284

 

I would start by having the batteries and alternator tested as well as checking the fuses and relays and inspecting all the know places where wires get chaffed. I hate electrical gremlins!

 

So I go the truck going. It ended up being the connection on the icp from when I replaced the harness.

 

Glad ya got it

 

You might want to look into those V figures with the engine running if that is after the glow plugs are done. You should be around 13.5 or higher with a healthy system.