Chevrolet Repair: 1992 olds bravada, starter solenoid, purple wire

Question
have 92 bravada- recently replaced almost everything and its been running great, now its down and will not even crank. starter and ignition switch are both fine-gets full power inside and you can hear fuel pump engage.but no matter what its not starting or cranking at all...?????any sugestions

Answer
GOOD MORNING JESSIE,HOW DO YOU KNOW THE STARTER AND IGN SWITCH ARE FINE ???? IF THE THE ENG WILL NOT CRANK IT IS EITHER ,STARTER,IGN SWITCH,BATTERY AND OR CONNECTIONS, LAST NEUTRAL SAFTY SWITCH. HAVE YOU CHECKED FOR POWER DOWN ON THE STARTER SOLENOID WHEN TURNING THE KEY TO CRANK ?
THIS WILL BE THE SMALL PURPLE WIRE NEXT TO THE MAIN POS BATTERY CABLE ON THE STARTER. WHEN KEY IS TURNED TO CRANK MODE SHOULD HAVE 12 VOLTS HERE. IF NOT CK FOR MAIN BATTERY POWER AT THE STARTER CENTER POST.IF NO POWER TO THE STARTER REPAIR BATTERY CABLE CONNECTIONS..[SOMETIMES THIS MAIN CABLE BUILDS UP WITH CORROSION.. IF NO POWER TO THE PURPLE WIRE WHILE IN CRANK MODE CK EITHER NEUTRAL SAFTY SWITCH OR IGN SWITCH. ALSO TRY TO SEE IF THIS WILL CRANK IN NEUTRAL IF SO THE NEUTRAL SAFTY SWITCH IS BAD OR MAY NEED ADJUSTEMENT..IF THERE IS POWER TO THE PURPLE WIRE ON THE STARTER SOLENOID WHILE IN CRANKING POSITION TRY TO TAP THE STARTER MOTOR WITH A HAMMER.[TAP-- NOT HIT HARD]WHILE HOLDING THE KEY TO CRANK POSITION, IF IT STARTS TO CRANK LIKE THIS THE STARTER MOTOR IS BAD.. .LET ME KNOW HOW THIS WORKS OUT FOR YOU.GOOD LUCK,,,TOM...