Chevy Tahoe wont start

Your Starter can be intermittent or there is a start wire that comes from the steering column switch, it can work intermittently. The start wire switches 12 volts to your starter solenoid ( small wire ) when you turn the key. You can jump 12 volts to the small terminal on your starter when it won't start to determine if that wire is not supplying the current and voltage needed. Make sure it is in Park with the emergency brake on! Try the easiest thing first, Rap on the starter with a hammer when it fails to start. check for loose wires ect.. near starter. Many times a starter can test good at a parts store but be intermittently bad on your vehicle.

Thank you. I'll try it and see.