Nope, I just sent you there because the problem started right after you replaced the transmission.
There are three circuits, the high-current, medium-current, and low-current circuits. You already proved the high-current circuit is working by jumping the solenoid at the starter. A quick way to test both the high and medium-current circuits is to pop the cover off the starter relay, reinstall it that way, then squeeze the contact. If it cranks, that just leaves the low-current circuit which has the ignition switch on one side and the neutral safety switch on the other side.
You can test all four circuits at the starter relay with it removed. Use a test light, (or voltmeter), with the clip lead grounded to the battery negative post. Probe the four terminals in the relay socket. The fifth, middle one, isn't used. One terminal must have battery voltage all the time. One must have battery voltage when a helper turns the ignition switch to "crank".
Move the clip lead from the negative battery post to the positive one, then probe the other two remaining terminals. Both should show a good circuit to ground. Find which of those four terminals on which the light doesn't light up.
Thursday, February 10th, 2011 AT 3:34 AM