I’ve replaced my starter battery and alternator the truck still won’t fire

First, check to determine if your battery is capable of holding a load for a sustained period of time and has a good state of charge. If the battery is super solid, I would recommend checking your battery cables. The cables could have extreme corrosion or connectivity issue in the cable itself. If nothing else, I would definitely check the engine to make sure it turns freely with a breaker bar on the crankshaft. These are good places to start. https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.