1991 Ford Probe, 2.2l 4cyl takes various cranks of key to st

At the transaxle NSS neutral safety switch at black and yellow wire look for power when key is in start position not there when you cycle key a few times the igntion switch is gone.

If power is there at NSS when key is cycle in start position. the NSS is okay. Now for the final at blue and red wire at the starter solenoid if you are getting the power and still refuses to crank over the starter solenoid/starter is bad.

I've look for a starter relay but there's none for this 1991 Probe.

Good Luck

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