Jumping stuff is a complicated and time-consuming way to find the problem. Instead, grab a test light and a helper to turn the ignition switch.
Do you hear a loud clunk from the solenoid engaging? If so, the problem is in the solenoid or the positive battery cable. Touch the probe of the grounded test light right to the large terminal on the starter. It should be bright. If it goes out when your helper turns the ignition switch to "crank", suspect the cable. If the light stays bright, suspect the solenoid.
If you don't hear the solenoid clunk, use the test light to check for voltage on the smaller starter wire when the ignition switch is in "crank".
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Monday, October 3rd, 2011 AT 9:02 PM