Stop throwing random parts at it. You're finding out that's the most expensive and least effective way to diagnose something.
Pull out the starter relay. That will provide access to the four terminals in the socket that correspond to the four parts of the system. Ground the clip lead of your test light to the battery negative post, then probe the four terminals in the socket. One will have 12 volts all the time. One will have 12 volts when a helper turn the ignition switch to "crank".
Now move the test light's ground clip to the battery's positive post. Probe the remaining two terminals. Both should read to ground making the test light light up. On one of those the light will go out when your helper shifts out of "park".
Determine which one of those four tests isn't working.
Monday, November 3rd, 2014 AT 7:48 PM