I got a head start on the port motors, per the headache I had with the starboard side. I preemptively rebuilt the TBI, and replaced the Oberg fuel filter and top filter right out the gate, to dismiss those issues. I like both motors on the same maintenance schedules, so I rebuilt the starters, alternators, and TBIs all at the same time, this year.

I thought I was having the same issue with the fuel pump as the starboard motor, but it's not getting any juice when I turn the port ignition breaker to "on." (the starboard motor fuel pump kicks on for 1-2 seconds when I flip the switch, as it should) I thought it may be a bad fuel pump relay or an interruptor from some sort of sending unit somewhere, so I bypassed everything and ran a hot to the fuel pump. Pump works fine, perfect fuel pressure. Next I noticed that I don't have any spark, then tested the fuel injectors with an LED indicator light that plugs into them, no fire their either. Starter has power, and turns over at the helm. Shouldn't have anything to do with the neutral safety switch. No power to anything else.

I have both batteries installed on the #2 bank, and no batteries installed in the #1 bank, but that shouldn't matter. I had the battery selector switch to "both" and the motor turns over at the helm. There are no loose "accessory" wires left to connect to the batteries. I did a quick check for loose or dangling wires and didn't see anything. The motor/ignition breaker isn't tripped. The wiring harness has a round connector that goes to the 16 pin for the ECU. I'm guessing the round connector is the same style 9 pin connector that Merc uses. I haven't messed with it yet. I have a good running motor on the starboard side, and I will likely try swapping computers at some point tomorrow. However, I would like to know if there's anything else I should look for, and a basic wiring diagram that gets me power to the ECU, that tells me which pin or pins on both the 9 pin, and the 16 pin that should have power. I would like to make sure that the computer is receiving power, before I waste time trying to swap them. (I don't believe it is, and I hope it's not... the much easier and cheaper fix is wiring, or sensors, vs ECU replacement)

Another issue that I'm having, which may or may not be related:

When I turn on the ignition switch on the panel for the starboard motor, I get no warnings at the panel or at the dash, and the motor starts with no issue at the helm or by jumping the starter.

When I turn on the ignition switch on the panel for the port motor, I get no warning at the panel, but I do get a "V-Drive" warning light at the helm. I disconnected the green wire on the only electrical connection that I saw on the V-Drive, and the light turned off. Still no power to the fuel pump or to the port motor. I tried jumping out whatever sensor or switch that is by connecting the two wires together, and still no power. The fault light on the dash turns off when I disconnect the green wire, or touch the two wires together, but neither scenario changes my power situation to the port motor. What does the sensor on the V-Drive sense? (temp?, oil level?) The oil in the V-Drive is a little milky, but it's full. The sensor doesn't seem to be any faults triggered from anything to do with the transmissions. Messing with the sensor on the V-Drive turned the fault light off.