external acc switch to bypass using key

Ok ckeeler this is what i will be going with: The Relay Its a RELAY AUTO SPDT 30A 12VDC PCB And from the schema of it... i hope i got the pins correct... Double check me if u please: Pin 2/5 = Coil (a.k.a. 86/85) Pin 4   = Common (a.k.a. 30) Pin 1   = N/C (a.k.a. 87a) Pin 3   = N/O (a.k.a. 87) Question is for the Pin 1 and Pin 3.. which one do i us for the B/W wire and B/B wire? David

you will need 2 of these, one for each ign wire. pin 4 will go to power, pin 3 will go to the ign wires, do not use pin 1.

Ok heres another check with a awesome drawing skills David

Oh yeah, does the 12v W HAVE TO BE from the white wire? Or could i use some other 12v wire in the car? David

Ok ckeeler thanks so much for the information you have given to me! But i have one more question... What wire would i need to find to check to see if the car was running or not? Like if it wasn't running then it would have 0v. If it was running then it would have Xv going through the wire. David

well, do you mean the ignition is on and powered? or the actual engine itself is running and making rpm's?

ckeeler: Sorry, when the engine is running David

well.....2 ways. you can use the tach wire but that tests with AC voltage, not DC. or you can get a 12v signal from the power that goes into the fuel pump in the fuel tank. it will show 12v for a second or two when the ignition is first turned on then go off, and not have voltage on it again unless the engine is running. i dont know the wire color, you will have to test for it at the pump.

Ok, coming back to this: Once i hook the wires up to the relays and i flip the switch, i take it that the car should start within 5 secs or less? Once the car has started with the momentary switch, do i cut the power to both relays? David