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 - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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