starter cranks then free spins gmc sierra

That prevents the mechanism from fully releasing back to the RUN position from START. Those lubes attract and hold dirt and turn into sludge. WD-40, spray silicone, or any other type of all-purpose lube will JUST MAKE THE PROBLEM WORSE. Try lubricating the lock cylinder with a liquid graphite solution or spray dry Teflon lube. If the starter motor stops, you’ve found the problem. To diagnose the problem, first try rotating the lock cylinder. So, if your starter keep running, the problem could be stuck starter relay contacts, a continuous ground on the starter relay control coil, or a binding ignition lock cylinder that keeps the actually ignition switch in the START position. Once grounded the starter relay moves the contacts, allowing power to flow to the starter where the power energizes the pull-in/hold in solenoid that moves the starter drive and connects the starter motor directly to the battery. It provides the ground to the starter relay control coil. If the transmission is in either Park or Neutral, power flows to the control coil portion of the starter relay.

In the start position, power flows to a fuse and then to the transmission range selector (auto trans) or park/neutral switch (manual trans).

You’ll see that power flows from the battery to the ignition switch.

Starter cranks then free spins gmc sierra