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To run an accurate continuity check both ends of the wire must be disconnected. You are reading the ground thru the bulbs or other components in the circuit.
You need to read the FSM and understand the wiring diagram. If it doesn't make sense, read it again until it does. Imagine the satisfaction you will have fixing these simple wiring issues without running to your computer asking for help. This is a 5 minute diagnosis job, and another 5 minute...
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.