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the glow plugs are bad when replacing replace the wiring harness as well any ford dealer will not replace just the glow plugs, i know i used to be there diesel mechanic.this is the reason it will start with the block heater is pluged in
its not the pump if it runs at all...try giving the batteries a good charge seperately out of the truck. if the voltage goes under 9volts when cranking the pcm will not boot up and send the cam signal to the ficm. also plugging in the block heater may help.
The block heater is already installed in your 6.0. The cord may not be there as it is an option in some states and standard equipment in others. The best way to see if your cord is there is to crawl under and look up by the # 4 cyl and you will either see 2 prongs sticking out for the cord or you will see the cord. The cord should end in the front bumper behind where the front tag would be. If you dont have the cord Id suggest getting it off ebay as it should be cheaper than the dealer. Hope this helps.
Look at the passenger side of the block. The rear freeze plug should have a block heater instead of a freeze plug. It'll be the rear freeze plug. If all you see is a 3 prong plug, the cord somehow got lost. I replaced on a truck very similar to yours. I got the entire assembly from NAPA. It comes with the piece that goes into the side of the block and has the cord with it so you can plug it into an AC outlet.