Quoted from BLACK_ROSE:
I'm glad u guys like the mod ,, 2 me it just lOOks to Busy !!! and that Piggy back incorporated w/ the other board ,, if something happen's and causes the Stern PDB to burn out in area's controlled by J6 / J7 ,, Ya think Stern's Warranty will cover /// No !!
The power for the LEDs comes from the 5v accessory plug and not J6 or J7. This is only to read their state and otherwise the harness acts as a pass-throught for the power to the voltages. Overall, interesting point and something we have considered, but not a real concern. While the production boards will have locking/tension fit plugs and headers to keep people from plugging in the harness backwards, it wouldn't matter if they did. The return for the flashers are already powered. Pinball machines, for whatever reason, control the grounding of the circuit to active flashers (as opposed to activating the current through the flashers.)