Bawausa wrote:The wiring diagrams I need are:
- diagram on how to re-wire a Yamaha engine harness and ignition key switch to connect to a Mercury ignition key switch
I doubt you can find a diagram from either Yamaha or Mercury that will give you a wiring configuration for using a Yamaha key switch and Yamaha engine harness to connect to a Mercury OptiMax engine. This unusual modification was probably created by the prior owners or operators of the boat, and is a one-of-a-kind installation. Lacking original documentation of what was done, there is no possibility of finding an accurate wiring diagram from another source.
A person familiar with both Yamaha and Mercury engine harness wiring and ignition key switch wiring MAY, after a careful inspection and documentation of what was done, be able to develop a new wiring plan for replacing the Yamaha ignition key switch wiring with a Mercury ignition key switch.
An alternative solution would be to purchase new Mercury engine wiring harnesses to connect to the new ignition key switches, and assume--a very big assumption--that something very weird has not been done inside the OptiMax engines or to their electrical connections that interface to the standard wiring harness.
A MUCH SIMPLER ALTERNATIVE would be to get a new key made to fit the existing ignition switches. A Yamaha dealer should have a variety of ignition key switches in stock, and I would expect that there would not be a thousand different keys. There may only be a ten different key in use. Also, a very close visual inspection of the ignition key switch may reveal an identify mark that encodes which key switch is to be used. This approach will be MUCH SIMPLER and MUCH FASTER and MUCH CHEAPER than your plan to tear out the Yamaha switches and replace with something completely different for the only reason you don't have a key that fits the ignition key switch. You should choose this plan and abandon your initial approach to solving this problem.
Bawausa wrote:The wiring diagrams I need are:
- wiring of the four boat batteries to the engines
The wiring of the four batteries to the engine should be rather simple to discover. A close inspection of the batteries, the battery switches, and the engine primary power cables will provide enough information for a wiring diagram to be created by anyone who is familiar with boat 12-Volt high-current wiring, battery switches, and outboard engines. If you are not skilled in this area, you may be able to hire some one who has the requisite knowledge.
Bawausa wrote:The wiring diagrams I need are:
- wiring of battery charging outputs from the engines to the batteries
The configuration for how each of the four boat batteries is to be recharged from the propulsion engines can be assessed in a similar manner as described above. I do not think that a Mercury OptiMax engine of c.2002 vintage would have an auxiliary battery charging output. The only charging current provided from the engine would be via the main power cables to the battery that was connected to those cables via the battery switch position.
Bawausa wrote:The wiring diagrams I need are:
- wiring for the many pumps
The wiring of the many pumps is likely to be as I described in my prior reply regarding sump pump operation. Typically any switch which controls a pump will be identified by a nearby label its function. Wire color coding will also help deduce the circuitry.