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Message: <blockquote data-quote="HD2500" data-source="post: 5550" data-attributes="member: 64">I'm trying to get to the bottom of an issue with my Dad's 03 GMC 1500HD.Problem is, usually the first start or after it's been sitting, you turn the key to crank, but the starter remains engaged without actually firing the motor. It will just keep cranking unless you turn the key off... Typically the following attempt to start it, the engine will crank and fire normally. I've done all the research on this problem that I can, just not coming up with any definite answers.Here's what I've replaced:-Starter (twice) & played with different shims-Ignition Switch-Starter & Ignition Relays-Ignition Key TumblerNothing has affected it at all. My best guess is that when cold, something is making a connection that keeps sending power to the starter solenoid. Then, when warm (after a few consecutive starts) that connection is lost, or no longer bridged. The next place I'm going to look is the Neutral/Safety Switch.Any ideas?</blockquote>