Ran fine yesterday won't start today

Hey guys i am wondering if anyoun can help me with this problem. Yesterday everything was fine, this morning i get in my 98 k 1500 to go to work and nothing happens but a click that sounds like the starter relay. I have checked all of my connections there tight, loadtested the battery it's fine, checked relays and fuses and pecked on the starter but no change still just a single click.

Hey guys i am wondering if anyoun can help me with this problem. Yesterday everything was fine, this morning i get in my 98 k 1500 to go to work and nothing happens but a click that sounds like the starter relay. I have checked all of my connections there tight, loadtested the battery it's fine, checked relays and fuses and pecked on the starter but no change still just a single click.

Try jumper cables from another vehicle, or another battery and
clean and tighten the ground connection from the battery to the block.
I just don't think its the starter relay.

Is the click from starter or relay box?
make sure it is in par/neutral then.
Check for voltage in start position at purple wire to starter solenoid.
Also.
Jumper 12 volts to starter small purple wire.
On starter pecking give the moter housing a good whack.
Let us know what that does.