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Here is my 69. I had to search quit a bit before I found a source identifying the terminals. Can't remember where I found it. Spade goes to coil negative
A proper Ammeter reading would be with needle centered at 0. It will show a little charge after starting, then should settle to 0. What is the condition of your battery?. Depending upon ignition type a weak battery/charging system could cause your issue. What is your voltage at the battery...
If you are checking resistance to ground from the Alt output stud you must disconnect all wires that are attached to the stud to get a proper reading. You really cannot check for grounds in a wire unless both ends of the wire are disconnected. Ohmmeters are for checking isolated circuits.
Are you referencing the Ammeter? If so, the needle should be centered after a few minutes of run time. If it is always showing a charge I would check the wiring and battery condition
If the needle stays in the same position when running as noted in your third picture, you didn't fix anything. The needle should swing to the charge side immediately after starting, but should settle back to dead center after a few minutes.
Yes, remove distributor cap, put test spark plug in end of coil wire while other end is still attached to coil, ground test plug. Key on, all primary ignition wiring hooked up. Hold soldering gun or electric engraving tool close to distributor pickup coil, pull trigger. Spark plug will fire...
The pickup coil and reluctor ring is a simple signaling device turning the primary on and off, building and collapsing a magnetic field. You can simulate that action with a soldering gun.
I'm not advocating you leave the jumper there, and you know that. Its a diagnostic tool, if the vehicle starts he can generally figure the ECU portion of the system is just fine and not worry about the mysteries inside the box. My way of testing this system would be using a solder iron to...
On a properly operating system, the Ammeter should consistently stay in the center and not read Charge or Discharge. During starting needle will likely be on D side, and after starting briefly be on C side of center, but should settle in the center.