There is no good reason for YT to put that second resistor in their 12v conversion kit, supplied with their 12v coil. You do not need it. Use only the original ballast resistor on the 3 terminal board.
IF their kit had not included the 12v coil, then and only then would you install the second ballast in series with the original for use with the original 6v coil operating on 12v.
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