How do I test the alternator? Hooked up to battery, got a voltage reading, started the car but it doesn't show anything on the alternator side

Leave the tester on the battery, it should read at least 12v, start your car, if the reading didn't go up for at least 14v, you're alternator is not working....

What is the Cigarette lighter adapter for?

to test the battery through the cigarette lighter of the car instead of raising the hood and clamping on the battery.

Will this also work on a 12v marine battery?

Absolutely. It should register around 12.0-12.6 volts when the vehicle it turned off. If it registers a little higher when the vehicle is running, then that means your alternator is working perfectly fine. It’s a great tool to have. It’s good to check your battery every once in a while. It’s worth the money.

Can this tester be used with three batteries wired in parallel?

If the battery voltage in parallel or series exceeds 3V, it can be measured

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