I bought a mariner 30a sn 689l414687 electric start but the battery cables were missing and not sure where to connect the cables to engine.there is a thick cable from the starter motor to a black relay or solenoid with a spare post next to it ,would that take the positive lead ? and further back on the block there is a post with several black wires which are grounded there , and there is sufficient room for another eyelet under that nut for negative cable .Also under the insulation cap from the starter motor cable it doesnt look like anything has been removed from there or undone.also there is a red wire with a black plastic fuse holder I think and bullet connector which I assume is the positive feed for the wiring harness.Any help appreciated cheers.