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May 20, 2017 at 20:08 comment added JimmyB Ballpark figures: Head+tail lights ~15-20A, AC compressor clutch ~10A, defrost ~10-15A.
May 19, 2017 at 16:00 comment added TheTechGuy99 Depends on the defrost. Some use the internal fans where others have internal warmers (usually back glass) both use up energy but not as much as the AC compressor usually. This is due to the fact it's on the alternator belt and uses that energy up.
May 19, 2017 at 15:45 comment added stannius Is it also true that running the windshield defroster also runs the AC? So, one should avoid that, too?
May 17, 2017 at 18:54 history edited TheTechGuy99 CC BY-SA 3.0
clarification for my previous answer
May 17, 2017 at 17:27 comment added stannius How much juice do the lights, radio, and AC or heat use? Obviously the answer is "it depends" but just on a rough order of magnitude basis? Which is the most important to turn off?
May 17, 2017 at 15:04 history answered TheTechGuy99 CC BY-SA 3.0