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I compared the wiring diagrams for 64 and 65 and, hopefully, I can explain.
In the 64, the wire comes from the battery terminal on the solenoid, through the ammeter, then on to the ignition and light switches. All the power from the alternator goes through the ammeter.
In the 65 (and I assume 66), the wire goes from the battery terminal on the solenoid to the fuse panel. Before the panel, there is a splice for a wire to the ammeter. The other side of the ammeter is spliced in to the wire between the ignition and light switches. The ammeter is only "sampling" the power.
Over the years, there have been a number of posts telling how to make the 64 wiring more like a 65, and, if needed, I'm sure I can dig one or two up.
Hope this helps
Terry
64HT
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