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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
hey, if youve been cranking on the engine with a good battery and the engine is cycling slow maybe you should throw a charger on it for awhile to top it up. If that doesnt help then it sounds like an ignition/electrical problem. Do the dash lights dim when rotating the engine (after charging the battery fully)? What is the mileage on the truck?
Check the battery cables. Both ends. sounds like a bad connection somewhere. Should turn over quickly with a good battery. If they check ok, the starter may be on the way out and not cranking fast enough.
On a side note, I have seen bad crank position sensors cause no spark and no spark.
Just for kicks, check all of the fuses in the power box under the hood.