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That is odd. Do you have any check engine codes in the vehicle? If the isolator is connected properly, it shouldn't have any affect on the starting. I'm presuming you hae a PTO setup on the truck with upfitter controls since you have the isolator? Make sure there is nothing on the system interfering.
LOOK HERE for the wiring diagram for that year and model in case you need it.
Recheck your wiring and make sure something didn't come loose on you since you did change the starter. Check the relays and fuses to also make sure the is no issue with them due to something that could ave occurred with the first start.
Also, if the engine gets cool, does it restart? If so, then there is something wrong wit hthe new starter. I've had several of them burn up on the first crank on these models. They are bad on burning out the solenoids. Check the starter when the key is turned and see if you have ignition power. Also test for power in and ground. I would rule that out first, ESPECIALLY if it a reman. Leece Neville has been using chinese parts on their reman starters and Delco has been making bad brushes lately.
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