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My 2001 F350 7.3L diesel will intermitantly become a no start or slow crank, normally on cooler days, even though the truck has been plugged in for hours.
The key point that I have noticed is that the radio cuts out during the glow plug cycle, and will sometimes get a clicking noise from behind the dash. Also when I am snow plowing with this truck the radio will cut in and out when operating the plow, Seems like a low battery voltage, but it checks out ok,
I have tested the batteries(both good), checked resistance of the positive cable right to the starter(.3ohms), Tested resistance of negative cables to engine and body ground(.3ohms),