Cuda acting up. Turn key and nothing?
What year is the car?
You have a clutch safety switch?
It is unclear to me if you tried jumpering the starter relay
So 4 major "areas"
1: Is the starter relay getting power from the key, and if there's a clutch safety switch, is it grounding the other end of the relay?
(How many "push on" terminals on your starter relay?
2: Is the starter relay good or bad?
3: Is the wiring to the starter OK? A bad main battery cable connection AT THE STARTER will prevent the starter from pulling in, as will a bad connection in the solenoid wire/ terminals
4: Is the starter bad?
So let's divide the problem into those 4 groups. You can start "somewhere in the middle" and divide the problem sortof "in half"
SO next time this happens, get ANYTHING metal, a screwdriver, quarter, keychain, and short across the only two exposed terminals on the start relay. If it cranks, you have eliminated the
starter
and the relay to starter solenoid wiring
and the main battery cable to the starter
IF it cranks, above, determine if it's the start relay. If you only have ONE "push on" connector on the start relay, unhook the wire, and use your "metal piece" to jumper from the big battery stud to the exposed "push on" terminal. If it cranks, the relay is probably good.
Then hook the 'push on' wire back up, and probe that connection with a meter/ test light while twisting the key to start
IF no light/ voltage, its either a bad bulkhead connection, a break in the wire (unlikely) a bad connection at the ignition switch connector, or a bad ignition switch