So heres the deal,fired up the new 505 sat night,it runs great but will not shut off with the key.It has msd 6al box and msd dist.The middle bulk head connector at the firewall was missing so i ran new wires from the bulkhead connector out to the 6al box,im not sure this is right.I dont belive i have all my starter relay wires correct either.Hopeing someone out there has made their own harness and can school me before i burn the car down.Anyone have a wiring diagram? Anyone wired their race car up like this and still used the key?Im not much of an electrial guru

You need to find the original wires (both the start and the run wires)going to the engine wiring harness for the ignition and use them both What year car and model are you working on? I may be able to tell you the original colors of those wires, do you have a volt ohm meter and know how to use it? If you have the meter use it to identify that circuit and use both wires, one will be activated with the key on and the other will be on only when the key is in the start position

70 roadrunner thanks Also need starter relay diagram this car has been apart for 8 years

The feed wires in the engine wiring harness to the ignition are 14 gauge dark blue with a white tracer on it to the original ballast reisitor and the coil and a 14 gauge brown going to the coil. Splice those two together to the 12 V feed wire for the MSD box. Actually you only need the two dark blue wires to the MSD box Check those wires with a volt meter to make sure they turn on and off and work in both the start and run position from the key. The starter relay has four positions for wires on it, the big one is for the battery feed and the fuseable links, the big main battery wire from the battery should go to the starter and another 10 gauge wire from the starter should be run up to the starter relay to feed the car harness. The other three connectors are marked S,I and G. The G is the 18 gauge brown wire with the yellow tracer ground wire from the transmission nuetral switch(the center pin on the transmission switch) and the I is for the 18 gauge yellow wire for the igntion switch to activate the starter relay to make the starter work. The last position is marked S which is for the 12 gauge brown wire to the starter solinoid (the small wire on the starter) which makes the starter engage. This information is from my 1971 Plymouth service manual so I hope it is correct for the 1970 models also I have a 1969 Dodge service manual also and most of the wires do match in the wiring diagrahms

Thanks for the info i'll re wire it tonight.Im ready to get this thing on the road,sounds good and responsive.

http://www.mymopar.com/index.php?pid=24

http://static.summitracing.com/global/images/instructions/msd-6420_frm28645.pdf

check out the diagrams if you print them it might help you when your out by the car.