1) I hope you tested the new starter before you installed it; I have come across brand new defective ones before-It's not common, but it DOES happen. You might have to remove it and bench test it just to make sure it IS good.
2) Did you try testing the OLD starter before you relinquished it for the core charge? At this point, it may NOT have been faulty after all.
3) Check ALL fuses-both in cab and under hood.
4) Some vehicles have safety features implemented: for instance, you might have a faulty neutral safety switch-it might not be able to start unless it believes it is in neutral or park.
5) If all else fails, (2 man job) check for starter voltage when key is in START position (starter removed)-wiring or relay problems.
6) Starter may be good, but not have enough power? Check battery voltage-should be 12.6 volts.
7) Even the best starter will not be able to turn over if the engine is seized or binding- make sure you can turn engine by hand (remove plugs (compression), put socket on harmonic balancer bolt and turn by hand IN DIRECTION ENGINE NORMALLY TRAVELS.
Hope this helps.
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