starting problems

A voltmeter with long clip leads is helpful. It can be placed where you can see it while you try to crank. Start with battery terminals, then start relay, on to motor terminals. If you find low voltage, when it should be near battery voltage, it is problem. On the relay, the NSS is ground, so the voltage should be near zero. Consult the wiring diagram in the factory service manual. There are links to them found with Google.