OK I HAVE A 88 K5 I WENT OUT TO START IT THE OTHER DAY TO GO PICK UP MY SON AND TURNED THE KEY , AND CLICK .... CLICK, NO START, SO I CHECKED THE BATTERY A LITTLE LOW BUT NOT BAD SOUNDED LIKE STARTER NOT TURNING , SO I BOUGHT A NEW STARTER , INSTALLED IT . STILL NO START I TURN THE KEY AND CLICK, TURN AGAIN CLICK , STILL NOTHING.SO I PUT A NEW BATTERY IN JUST FOR GOOD MEASURE, NOPE STILL NOTHING. CAN ANYONE HELP?
(SORRY ABOUT CAPS BEFORE I NOTICED I WAS NOT GOING TO REWRITE ALL OVER AGAIN)

 

uh, bad electrical contact.

Take all the heavy battery wiring apart and clean everything with sand paper until it's all shiny. Probably just corroded battery contacts, but it could be bad ground connection on the engine or corroded ring terminal at the starter...