what size/pn is diode between balast and start relay

[3404speedcuda]

Hey guys,
I have installled the painfull harness and when I turn the key to run the starter engages, then I noticed "one way" that painless shows is to use a diode between balast and start relay can you tell me what size and or mopar part number? working on a 73 Cuda with a 340 4 speed.
thank you,

Ken

[ShelbyDogg]

Is it only running the ignition and starter relay  in the "start position"? or are you running the starter relay and a relay that will supply the ignition voltage right to the coil.   Get something like a 10 amp diode or bigger.  My electronic surplus store has any size for around a dollar or less. Try Radio Shack, but it will be more. 

If you are switching relays, you could use a small 2 amp diode.