Q: Truck will not start after new Alternator was installled on 1999 Ford F-150 Lightning

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Truck will not start after new Alternator was installled.
Could this have effected the fuel pump cut off switch.
The starter motor turns hard but definitely no spark.
The truck did start fine with the new Alternator for the first week.
(1) Answer
it only can be 1 of 3 things battery alternator or starter check power and operation of all to narrow down.use volt meter see if your getting charging voltage at the battery.I was told by my local auto parts store they had a customer replaced alt and not compatable with lightning.they told me go some where else if you need a alternator. omg good luck.fuel cut off only triggered by impact but check power