2007 9400i not cranking

Another possibility is a bad solenoid. I’ve had solenoid,starter,blower motor etc. that were junk out of the box.

 

Batteries are your problem, load test them and find the bad one. To cold to start...batteries. Turn the blower motor off starts. Batteries, you bypass everything that needs voltage to open relays to start by your hammer jump. Your truck will start with one battery or one bad battery will drain the other 3 if it’s bad. Like the other guy said load check your batteries.

 

If you have to shut off the blower motor to correct this intermittently, I would say you have base cab power supply problem. Check the big copper bus bar in the fuse panel with the two big power studs with all the red wires on them, these are your battery feeds. Your solenoid at the firewall is triggered by a smaller pink wire. This is getting power from your key switch in the cranking position. This wire is likely losing power somewhere. It leaves the key switch as pink wire number 17, then goes to an adaptor block and becomes pink 17B then out the firewall. I don't know where the adaptor block is, but you can just run a new wire if needed. The solenoid just grounds to the firewall I believe. I would take off that pink wire at the solenoid, make sure the connector is ok, then test for power while someone holds the key in the crank position. You might have to wiggle the wiring to find your bad spot.

 

I chased intermittently starting issues on my international for the last 3 years. Several sets of batteries and at least 3 starters. Grounds, key switch, relays etc.


Finally that last time I did the starter I had all new cables made up. They looked fine on the ends and outside but when I cut them open they were full of creepy green death.
Now it’s been a year without one single problem.
I think the low voltage was killing the starters. Always did well for a couple of months after new stater then would just get worse and worse.

 

Had a 75 disco Nova that developed that same issue. Ends of cable were great. After removing red cable...I could see where. It had the "green death". Apparently years of water dripping or slung under fender.