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Ok I have the 6L offroad MSD box and I can not find even on the msd site nor in the manual what this plug is for...????
It is the 4 prong plug on the left...
Off of MSD's site, the 4 prong plug is for the optional rev control. If you arent using it, seal those wires to prevent debris from collecting in them. http://www.msdignition.com/pdf/6470_frm22699.pdf page 1 on that link.