Good evening! I purchased an older, 1982 Renken 185 Bow-rider, boat from a neighborhood gentleman. He ?inherited? it from his father-in-law. At one point, the engine was replaced with a bigger I/O motor.. a 350 GM. There is a thick tannish wire, thicker than wires that run accessories, but not quite as thick as the mains to the battery terminal & starter. The tannish wire reached and was resting, unattached to anything on the passenger side of the motor when I bought it. The eyelet for the wire is pretty big, so I am assuming it must go to the alternator because there is no other post on that side of the motor within reach, aside from the water temp sensor which has a very, very small stem and nut on it going into the block. There also is a red wire of the exact same size in regards to length, thickness, and eye-hole right next to the tannish one and both come from under the motor through a black wire harness (which makes it somewhat difficult to follow back.) I placed a tester on the tannish wire and it receives constant power from the battery even with the ignition switch on the ?off? position. If I disconnect the negative ground wire that supplies the navigation lights system, this tannish wire will also lose its power feed, otherwise it gets constant juice. My question, do I want to hook up BOTH the red and tannish wires to the (Bat+) on the alternator? I am assuming (I know, never a good thing) that red is always needing power, but the previous owner says ?he thinks? the tan-colored wire was hooked up to the (Bat+) post on the alternator while the red just was laying there. Please see the attached photos for reference.Thanks for any input and advice!!! 
