@ThreeEyedBandit:
With Key set to On but Engine Off (KOEO), and parking brake disengaged, none of the three lights are on. :( So now I'm suspecting the charge light relay.
Your explanation of B2 (Y-W wire) was very helpful. I'm used to seeing power come from "above" and ground come from...
I attached a screenshot of the relevant troubleshooting guide and I did the procedure for inspecting A/T fluid temperature warning light. The bulb works and the harness works.
Following your logic, it must be the cluster because the A/T temp warning light should still light up when the key is...
His question was specifically when the key was set to the "ON" position (just before cranking).
Based on my reading of the wiring diagram, it should be OFF unless the temp sensor sends a ground signal. I'm no expert though. I don't have video proof of how a 1991-1992 3FE-powered FJ80 should...