I just put one in the 1979 mercrusier 260 with 350 Chev. As the battery is out of the boat I don't know if it's hooked up right or not. All 4 wires on the replacement are just the same, black. I got the starboard & port senders going to the right place, don't see how I could screw that up, but I'm not sure they are hooked up right after that, only two choices. Does it make any difference? <br />And as bare as the old wires were it seems to me there should be a blown fuse somewhere. Is that a good bet?