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The mechanic does not understand basic electricity. Sounds like he is regurgitating something he read on the internet. The world has been jump starting dead batteries and using the alternator to charge them since alternators (and older style generators) were discovered.

From any Mercury Marine dealer.

Can you copy and paste the snippet from the SM where that is stated?

So on the red and black wires you are seeing battery voltage only when the motor is off but then no increase in voltage when the motor is running at a fast idle?

Yes. Now connect the yellow input wires to the regulator with the red output wires connected to the battery and the regulator case grounded. You should see ~ 14 DC volts (meter set on DC) at a fast idle. Important that the regulator is connected to the battery. Otherwise no DC output.

Correct. Just connected my meter to a 120 volt AC outlet. Set on DC. A steady 0.24 DC volts were seen.

This is from a Mercury service manual for the OP's voltage regulator. But even if the regulator tests well, with no DC output with sufficient AC input, the regulator is faulty.

You are seeing battery voltage on the stator output wires with those wires not connected to the regulator?

It is a voltage regulator. Not just a rectifier.

If the motor was running at a fast idle and the two yellow wires were unloaded (not connected to the regulator) then the stator is kaput. No input to the regulator equates to no output from the regulator.

By serial number your model uses a voltage regulator. Which of course has a rectifier inside. Single phase AC output from the applicable coil of the stator to the regulator. On the two yellow wires. DC output from the regulator on the two red wires. Case is grounded. If the regulator fails to...

What are the inspection officials looking for? I thought it was mainly for accuracy of volume.

The oil pot icon is used just to refer to the oil system. Same icon is used for tachometers when used with two and four stroke models. Later Yamaha 6Y5 tachometers have a two stroke mode and a four stroke mode. And instead of lights they used LCD's. When in the two stroke mode three icons are...

The gauge you have does not indicate low oil pressure. Oil quantity indications only. Yes, the tachometer will tell you what the alarm is about. Low oil quantity in a two stroke and low oil pressure in a four stroke. And over temperature in both two and four strokes. But it in no way affects...

Now you need to decide what sort of instrumentation that you want? Analog needle and dial. Analog with digital display. Digital with digital display. Yamaha brand or non Yamaha brand?

The alarm system is completely unrelated to the gauge.

Most Yams have circuit protection for starter motor relays. Those Yams that have a starter motor solenoid activated by a starter motor relay do not have circuit protection for the solenoid. Only for the relay. All Yams have a kill switch to stop the motor. Either when the key is turned to off...

On the T9.9 models Yamaha calls it a relay.