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Timeline for car power line after engine start

Current License: CC BY-SA 3.0

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Sep 7, 2018 at 8:21 answer added Steve Matthews timeline score: 1
Sep 7, 2018 at 0:00 history bumped CommunityBot This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
Aug 7, 2018 at 23:01 history bumped CommunityBot This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
Jul 8, 2018 at 23:05 comment added Tony Stewart EE75 mechanics.stackexchange.com/questions/22638/…
Jul 8, 2018 at 22:48 history bumped CommunityBot This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
Jun 8, 2018 at 22:34 answer added kyle_engineer timeline score: 0
Jun 8, 2018 at 19:06 history bumped CommunityBot This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
May 9, 2018 at 18:22 history bumped CommunityBot This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
Apr 9, 2018 at 17:53 answer added Rowan Hawkins timeline score: 0
Apr 4, 2018 at 22:04 comment added Moab Install an oil pressure switch that activates a relay.
Apr 4, 2018 at 18:24 comment added 3Dave Install an optical sensor in your tachometer, behind the 500 RPM mark. Have a microcontroller, which boots up when the car is turned on (pre-start), watch the sensor. Wire the sensor to an interrupt on the microcontroller. When it detects the needle swing in front of the sensor, activate your relay. OR, describe what your real application is and see if we can suggest a rational solution.
Apr 3, 2018 at 15:18 comment added JPhi1618 I think your best bet is going to be finding a way to turn on your relay when charging voltage is over 13v. That's a clear indicator that the engine is running and would work on almost any vehicle.
Apr 3, 2018 at 14:05 comment added Solar Mike Therexare some split-charge relays that only trigger when the supply voltage exceeds 13.8V - maybe worth looking at those...
Apr 3, 2018 at 13:56 comment added Pᴀᴜʟsᴛᴇʀ2 There may be something like that, but most circuits I'm aware of either have constant power, or key on power. I've never found one which only provides power after the engine is started. There may be something in conjunction with a body control module. If not, you may have to home brew something ... an Arduino, maybe? Just a thought.
Apr 3, 2018 at 13:42 history asked John CC BY-SA 3.0