Start/run circuit

[A110235]

I am hooking up the brain for my fuel injection system in my '71 Challenger and the instructions say I need to power it with a circuit that has 12V during cranking and running.  Is there even a wire that has that?

Kyle

[rattlesnake]

Don't know how much power your looking for and not familiar with fuel injection needs, but there are a few circuits that have power when cranking and running. Lighting circuit for one, there are also a few plugs on your fuse box that can be utilized.

[A110235]

I don't know how much power it will use either.  It was a small wire (maybe 18 gauge) and it think it is used to sense when you are trying to start the car, not actually power the unit.  It had like a 12 gauge wire for main power.

I got tired of laying on my back under the dash with a flashlight with my meter trying to see what had power and when.  I'll have to scope out the lighting circuit.  Thanks for the info rattlesnake!

Kyle

[Chryco Psycho]

you can tie into the wires either at the bottom of the column or at the ballast resistor , they will be brown & blue , brown is start blue is run & both need to be connected . It just trips the relay for the main power from the battery ,very light load .

[67vertman]

you can tie into the wires either at the bottom of the column or at the ballast resistor , they will be brown & blue , brown is start blue is run & both need to be connected

 

That is how I ran mine (ballast resistor), 1 year in no issues. 

[A110235]

Alright, thanks guys!

Kyle

[dodj]

It just trips the relay for the main power from the battery ,very light load .

What do you mean 'trips the relay?'

[Chryco Psycho]

most Msd & computers use a 12 ga wire to feed power from the battery or similar such as power at the start relay , the smaller gauge wire that connects to the start run feed is usually 18 ga & just switches on the power inside the MSD or computer using a relay

[dodj]

Oh OK. I was thinking 'outside the box'