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Hello, my name is***** will assist you.
The only two wires that run from the engine to the outdrive are for the trim gauge and the trailer switch. Trace them back onto the engine to where they plug in, unplug them and then see if the engine will start. If it does, there is either an issue with the engine harness or the trim sender on the drive.
Are you sure that they go thru the transom and not going to the distributor on the rear of the engine?
What color are these wires?
Also, do you have the serial number of the engine and the drive?
Do the wires look like the ones in this pic on this page if you blow it up?
Does the trim gauge in the boat work?
Odd, those wires really only go thru the harness to the dash and one goes to the trim to stop the tilt and have you hit the trailer button.
Try to unplug all 4 or 2 depending on the set up, just tape them off so they do not ground against the block and see if the engine will start.
The connector is the standard one that Mercury uses for most of its connections that it wants to keep water tight.
They are part 6 in this diagram.
Theyt should not, that is what is making this so confusing. Those wires have to be going into the harness and coming out somewhere else.
That did work? With the trim senders unplugged the engine started?
Try leaving the trim wires plugged in, but disconnect the trim gauge. The purple and the black from it. The purple will be hot when the key is turned on and the black is a grond, so dont let them touch.
There has to be another cause down stream. Try that with the gauge.
Also keep in mind that the shift interrupt switch uses the same type of connectors, and only has 2 wires.
With a multimeter we can test it to see if it is working correctly
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unplug that shift interrupt switch and see if it will crank over. It is designed to stop the engine for just a split second when shifting. Do not connect the wires together, just leave then apart.
Great test there. Measure the voltage like that again, this time on the red of the key switch. If that is good, move to the purple and see if it falls off. If it does, replace the key switch. If it does not, the issue will be in the harness on the engine