How much electric power does my truck consume?

Question

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?

Solar Mike · Answer

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.

How much electric power does my truck consume?

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