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12v source only if engine is running?

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Old Nov 15, 2024 | 01:41 PM
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12v source only if engine is running?

Looking to tap a 12v source that would exist only if the engine is running.

different that a key on source.

 
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Old Nov 16, 2024 | 05:34 AM
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I don't think there is such a thing. The motor doesn't produce electricity except through the alternator and it's hooked to the battery so that wouldn't work.
 
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Old Nov 16, 2024 | 06:11 AM
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It came to me in a vision

i think a oil pressure switch that comes on at a preset psi. The switch would only close when the motor is running.

i want to turn a boost controlled additional fuel pump to a switched controlled one while the engine is running.

the pump blows a fuse if the pump is running and the motor is not consuming fuel.

 
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Old Nov 16, 2024 | 04:49 PM
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Maybe add a hall effect switch at one of the pulleys tapped to a relay to engage when there is a signal present?
 
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Old Nov 17, 2024 | 08:26 AM
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From: Too close to Houston
Originally Posted by speakerfritz
It came to me in a vision

i think a oil pressure switch that comes on at a preset psi. The switch would only close when the motor is running.

i want to turn a boost controlled additional fuel pump to a switched controlled one while the engine is running.

the pump blows a fuse if the pump is running and the motor is not consuming fuel.
There may be a signal like this already coming from the transmission. The TCM might need to know there is pressure, or the torque converter is locked, etc.
 
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Old Nov 17, 2024 | 12:38 PM
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delete post
 
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Old Nov 17, 2024 | 12:55 PM
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What a about the upfitter bundle in the passenger foot well?

https://www.ford-trucks.com/forums/1...ch-wiring.html

Would any of those work?
 
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Old Nov 17, 2024 | 03:56 PM
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up fitter switches would be too manual

Im think I am going in the direction of an oil psi normally open switch that will come on at a few PSI.
 
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Old Nov 17, 2024 | 04:04 PM
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Originally Posted by speakerfritz
up fitter switches would be too manual

Im think I am going in the direction of an oil psi normally open switch that will come on at a few PSI.
With Canbus, it may not be what you are looking for. It may put out a variable voltage instead of an on/off signal since it is actually measuring pressure. In fact I may trigger a CEL. BUT you CAN get an on/off pressure switch and T it into the oil pressure circuit, OR the fuel circuit itself. Rig it with a time delay so that it wont actually kick in until the fuel pressure has been stable for a set amount of time. Now if you had an SPE DPK, their kit provides a tap for just such a thing.
 
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Old Nov 17, 2024 | 05:11 PM
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Originally Posted by acdii
With Canbus, it may not be what you are looking for. It may put out a variable voltage instead of an on/off signal since it is actually measuring pressure. In fact I may trigger a CEL. BUT you CAN get an on/off pressure switch and T it into the oil pressure circuit, OR the fuel circuit itself. Rig it with a time delay so that it wont actually kick in until the fuel pressure has been stable for a set amount of time. Now if you had an SPE DPK, their kit provides a tap for just such a thing.
if I buy an oil pressure switch and connect the switch to a t fitting off the oil temp port, then run 12v from the battery to the switch, then to the relay I need triggered….it should be fine.


 
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