Potential ignition issues

When your car was running, power should have been coming from the alternator.
The ammeter should have been indicating battery neither charging or discharging.

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For starting, power comes from the battery.
Turning the key to start, current should flow through the ammeter to the ignition switch.
The ammeter should show slight discharge. Does it?
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If not, and you know power is making it to the key switch (previous test), then there is a break in the starter relay circuit and possibly also the ignition start (J3).