I have an old Whelen Deck-Master (strobe not Halogen) missing the power cord. On the back of the unit it has a 4 pin Molex group and a seperate 3 pin Molex group. I'd like to get or assemble a power cord for this unit. Question is are both Molex pin groups used for power? If so, how would I go about setting up a rig for this? Pardon my ignorance on this type of thing, but I appreciate any assistance.