Sort of depends on age of vehicle instead of your age. Newer vehicle systems with computer controls and 'security' systems read a chip or code marker from the key or ignition cylinder in 'active/key in the cylinder' and 'ping' the ignition at various intervals- 2 to 10 seconds depending on system programing- and the computers often do security status checks by 'pinging' door sensors, brake and seat belts, window sensors as 'active' instead of 'standby' If your truck is 10 years younger than you, likely no problem with the points ignition and roll up windows by hand. If the truck is not of legal drinking age for a human-then key in ignition cylinder has computer and security system doing lots of 'get ready to start the engine and reduce security' checks and drawing power almost as much as the 'on' position of start the fuel pump and check the seat belts and engine temperature, dash lights- but turn off the security system. Pull key out and the little red security light flashes maybe 20 seconds to a minute doing a check of sensors table looking for a 'ping' from the sensor. Leave it in ignition even in 'off' and the security system, engine monitors do a 'ping' of sensors instead of just the status table chip and this requires a pulse from all the sensors, not just a 'grounded/closed' pulse from the door sensor that got opened manually. Early 2000 or so some security system got the separated battery in the computer good for a month, vehicle battery is not connected UNLESS key is in ignition cylinder, the main battery power is available for security system to draw on. Check your electric bill for leaving on a PC all night compared to actual unplugging it in a office with say 5 of them or a home with teenagers on Facebook with their own systems- then imagine the power is off from the electric company generator and you're using a battery pack with limited capacity. Industrial equipment with computer controlled ignition and emissions controls, fuel injectors can have some of same electric draw issues with key in ignition cylinder even if key isn't 'chipped' RN.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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