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Monday 18 December 2017 at 00:54
If you are using LED flash lamps, you do not need the larger warming resistors. Just leave them disconnected.
If you are using standard incandescent flash lamps, the larger warming resistor should be 330ohm 2W resistors, not the 27 ohm you have in the picture. The warming resistor is there to warm t...
Source: http://pinside.com/pinball/forum/topic/firepower-89-flash-lamps-connetions-and-parts#post-4128829