Engine running trigger?

[anguilla1980]

My switch panel has a couple of trigger inputs. I plan on using these inputs to automatically trigger things to go on based on only if the engine is running, that way they don't cause draw during cranking.

The only way to get a signal based on the fact of an engine running that I can think of, would be something like a pulse trigger switch off the tach wire I can calibrate for 600rpm or so (since good mini starter can crank at above 400rpm and my idle is 750).

Has anyone ever bought and set up anything like this? Any recommendations on a pulse trigger switch for this type of application?

I'm also open to other recommendations on how I can get a trigger signal based on only the engine actually running.

Thanks!

[Lonnies Performance]

Maybe use an oil pressure switch with a pressure value higher than what is made at cranking RPM?

[anguilla1980]

Maybe use an oil pressure switch with a pressure value higher than what is made at cranking RPM?

I have an Accusump that's wired to prime when the ignition is turned on which may trigger that. Thanks tho.

[blitzer454]

Usually accessory power is off while cranking but then comes back on when the key returns to ignition on. In other words accessory power is on when the key is either in the accessory or ignition ON positions, but not in the start position unlike ignition power which does stay on during cranking.

[anguilla1980]

Usually accessory power is off while cranking but then comes back on when the key returns to ignition on. In other words accessory power is on when the key is either in the accessory or ignition ON positions, but not in the start position unlike ignition power which does stay on during cranking.

Correct, however I'm using a solid-state switch panel (think PDM) and no longer have a traditional ignition switch like a street car. So all that factory wiring is out the window.

[blitzer454]

In that case I would use a relay circuit with an input connected to the start terminal on the starter that cuts power anytime start is active. So basically creating a new source for accessory power.

[anguilla1980]

In that case I would use a relay circuit with an input connected to the start terminal on the starter that cuts power anytime start is active. So basically creating a new source for accessory power.

Hmm, that's a good thought. But I'm wanting things to power on in stages and I don't see how a relay like that could send only a signal to the trigger input on my PDM only after the engine has started.

[blitzer454]

I thought the main goal was not to draw power while the engine is cranking. Actually if you don't need accessory power from the relay circuit then you could just send the crank signal directly to the input of the PDM and not use a relay. Anytime start signal is high the engine is cranking. Of course that still doesn't provide a signal that shows that the engine is running, but I don't see the benefit of that anyway. Good luck.

[Richard454]

Here's how I did it-

The fans & AC get power after a delay (mine is set to about 6 seconds -but adjustable up to a minute) after the starter is run - just like the delay on new cars.

If you try to start- then turn off the ignition -it will reset the timer.

I have ignition power- ignition & start power- and ignition delay -no power start-

And also added a ignition timed output- Hella relay (up to 15 minutes after you shut off car) for Power windows /headlights.


This is a second fusebox for all my add-ons-

[anguilla1980]

That's a good way to do it instead of something based on engine run. I hadn't thought about using a delay timer since I'm all solid state programming with no fuses or relays. I wonder how I could adapt that idea, I'll do some research.

Thanks!

[Richard454]

Here you go-

Solid state- programmable- delay on and off

https://www.rowe-electronics.com/amplink

http://pdm60.com/wp-content/uploads/...anual-2016.pdf