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I have a 2011 Nissan Frontier Pro-4x. I want to get a general idea how much power I could draw from my alternator while driving. For that, I want to find out how much power my truck uses in the first place.

My alternator produces up to 130 amps, assuming a voltage of 14 volts while driving, around 1820 watts

How can I find out how much energy my truck consuming and how much do I have left over, with truck driving on a highway, lights off, stereo on, etc.? Is it possible to measure power consumption of the whole system using some kind of tool?

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Headlamp bulb 60/55 W and there are two so 120W on full.

Heater motor about 10A

Wiper motor 10A and so on.

But use an ammeter - used to be fitted as standard - now aftermarket and more accurate. The old 2” ones were just an indication.

Once the battery has been recharged after starting then most of the alternator power is available.

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