Already have ran wires from the battery to up front for use with a different Garmin GPS (worked perfect.) Just cut off that round plug for that GPS when I purchased the 1490. Stripping back the insulation I find four wires...red, white, black and green. The plug for the 1490 has red, white, yellow, green. First thing I tried was connecting all four to all four (connecting like colors except for yellow/black) NO GO. Next, I tried just red and black to red and black. NO GO. I just tried red and green to red and black. NO GO. You get the picture...how do I connect this new plug?