While driving around town or long distances after stoping for a short time (minutes) truck will not start. Plenty of cranking power and battery is new. Truck is trying to start and initially the engine stutters slightly and the starter just cranks until I stop. Must wait a full 10 minutes before starting. No problems at high speed (80 mph) or low speeds. Gasoline engine 8 cylinder
The engines run very lean for fuel efficiency. Although a "cold start sequence" gives the impression of freezing temperatures, the operating range is much higher. The water temperature sensor (some have 2) may be staying too warm for the reset. You may need to change the sensor. Then the fuel mix will be richer and the engine will start.
SOURCE: 1984 Ford F-150 Starter problem
You have a bad connection. It will pass enough current to keep things running, but the starter load is causing it to burn the spots that are making contact.
I had this same issue with my '86 F-150, and the final solution was to replace the all the heavy cables: battery to solenoid, solenoid, to starter, and block to battery ground. Thoroughly clean the block where the negative cable connects, and the battery terminals.
SOURCE: Ford 2003 Expedition starts then shuts down
The only idea I hbave is for you to buy a OBD II sensor code reader. Know half the time the codes are generic, BUT also if you go buy a Advance auto they will read the code for you for free. And that code is the correct answer to your problem. Just make sure if your truck loses the code when you cut it off, that you don't cut it off when you get to advance auto.
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SOURCE: ford f250 superduty turbo diesel 7.3L Will not crank
Charge the batteries. take a Reading to make sure that you are getting almost 14v to both batteries. If it is not charging then take the alternator back off and have them check it. you might have bought a bad one. There is a way to test the glow plus with out taking them out. ( Take a piece of wire long enough to reach all the glow plugs from the battery. unplug the glow plug wire.If you touch the end of the glow plug with the hot wire it should make a little spark. if no spark then the glow plug is bad. do this to each one, but one at a time)
SOURCE: 87 f250 drained brand new battery
I would first have the alternator checked by an auto electrician to ensure it is working correctly and is providing the correct volume of current. It may be faulty and when driving you will be drawing battery power instead of power from the alternator to run the electrics. This will drain the battery.
Alternators do not last forever and if you are still running the original unit it is likely to be on it's last legs and you will need a replacement unit.
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