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I would also second the idea of installing a block heater on your truck. At home, I will plug it in with a timer that turns on about half an hour before I need to drive. When I go to start, she goes like its 80 degrees out. Even so, I only use it when its really cold, but it could save you alot of headache. Good luck with the truck.
Garrett
The solenoid is about an $11 item and if the contactor isn't being made, you will hear the solenoid click and no power will go to the starter. Take a jumper cable from the positive side of the battery and to the starter terminal on the solenoid and see if the starter spins.
I had a solenoid stick about 2 months ago and had to rip the battery cable out of it's terminal lug to stop cranking - even with key-in-hand!
I tried that before heating the starter. I jumped a cable from the positive battery terminal to the "right" or other side of the solenoid. Nothing. Then I thought "duh" gotta have the ignition turned to the "run" position. Nada.
But heating the starter up with the torch did the trick, leading me to believe that the solenoid is OK. Am off work today so I will pick up the starter.
The solenoid is not a go-no-go part necessarily.
On my 89 Cougar we were on a college road trip to Winnipeg and I had one go at the US-Canadian border in North Dakota.
We jumped it with a pair of pliers, and the car did start twice after that, but when we got to Winnipeg, it died again. I was able to replace it in the parking lot of Canadian Tire (and it was about -10 below at the time).
It's the exact same solenoid as was used on pretty much every Ford vehicle for about 30 years.