Sounds like the S terminal isnt getting power. You have two power cable that go to your starter solenoid, a power cable that has direct battery power, and the s terminal which gives power when you turn the key to the start position. First things first, verify that its the problem. Use a DVOM and check the voltage to the S terminal from the ignition switch while trying to crank. You should see battery voltage. If you see none/low voltage then theres your problem. Check the voltage for the S terminal at the back of the ignition switch, if its battery voltage then there is a break in the wire, if its 0V then you need an ignition switch. Hope this helps!!
If battery is good & starter .one thing did starter come with new soleniod. if did check cables maybe corroid on the inside of cable if can cut a **** in cables to see if they are . good ground needs to be checked if not any of these see if you can turn engine with pull bar on crank bolt if turns motor not locked up so it got to be one of the above things.
SOURCE: 1997 sierra has good starter but clicks once when trying to start
replace both battery cables if they have not been changed. if they are ok. probably the starter solenoid.
SOURCE: new battery starter benched tested good starter
This problem is caused by the starters solenoid contact shoes being burnt and not always making a good connection, this is a common problem on Denso type starter designs which all GM cars and trucks use. You can buy just the contact on eBay. You can also order a repair kit from the web site below.
http://www.nationsautoelectric.com/densoparts.html
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