12vdc engine running source
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Brassmonkey
Cruzin' Mel Man
Re: 12vdc engine running source
NecroWolf is right. ign in the fuse box means the power is on only when the ignition is turned on, not when the key is in. If you don't believe that, get a multimeter and check it out. The only thing that gets power when the key is in, is the buzzer that lets you know the key is inserted and the door is open. There are several relays under the hood that will provide a 12v keyed power source. Fuel pump, wipers, abs, etc. just pick one. If you are going to run fans, which draw a lot of amps, I would use a relay that is activated by a keyed power source.
NecroWolf is right. ign in the fuse box means the power is on only when the ignition is turned on, not when the key is in. If you don't believe that, get a multimeter and check it out. The only thing that gets power when the key is in, is the buzzer that lets you know the key is inserted and the door is open. There are several relays under the hood that will provide a 12v keyed power source. Fuel pump, wipers, abs, etc. just pick one. If you are going to run fans, which draw a lot of amps, I would use a relay that is activated by a keyed power source.
mattw
Active member
Re: 12vdc engine running source
You guys just aren't understanding what he is asking for. He only wants 12v when the engine is "RUNNING". He could care less about the key or what position its in.
Now, to answer his question. There is no such wire/circuit to tap into. Your best bet would be to build some sort or RPM intelligent relay that turns on a relay when it sees > ~500 RPM..
I bet if you were to do some google searches you could find a schematic for something like that.
Good luck and what do you need it for?
-Matt
You guys just aren't understanding what he is asking for. He only wants 12v when the engine is "RUNNING". He could care less about the key or what position its in.
Now, to answer his question. There is no such wire/circuit to tap into. Your best bet would be to build some sort or RPM intelligent relay that turns on a relay when it sees > ~500 RPM..
I bet if you were to do some google searches you could find a schematic for something like that.
Good luck and what do you need it for?
-Matt
SCWolverine
New member
Re: 12vdc engine running source
Something, somewhere in the datastream (if nowhere else) tells datamaster what to do with the "Eng Running" cell. Wether or not it is something that can be tapped, IDK... Has to be a simple way to "sense" voltage on the tach feed, and trigger a relay from there.
Something, somewhere in the datastream (if nowhere else) tells datamaster what to do with the "Eng Running" cell. Wether or not it is something that can be tapped, IDK... Has to be a simple way to "sense" voltage on the tach feed, and trigger a relay from there.
Brassmonkey
Cruzin' Mel Man
Re: 12vdc engine running source
You are absolutely right, I do not understand. To run fans you do not need the motor to be running.
You are absolutely right, I do not understand. To run fans you do not need the motor to be running.
