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What engines are you working on?
When you hit the trim buttons, either on the control handle or the ones on the engine, can you hear the trim relays click?
Do you have the engines covers off so that you can hear it, it would be a faint sound
The other question I have is these motors should be under warranty. Are you looking to start tearing things apart and testing them?
Does the engine have analog controls or digital controls?
Do you have a voltmeter, and do you know how take voltage measurements?
If there is no clicking from the relays then there is either no power to them, or no power to/from the trim buttons.
Lets start by checking the fuse. Do you know where the fuse panel is located on the engine?
The 60 amp fuse. Check for power both into, and out of, the 60 amp fuse. And let me know if you have power on it or not.
Are you positive that your meter results were accurate?
No, there is no such thing as a current regulator. A sitting battery measures roughly 12.5 V, give or take a few tenths. Where ever you test voltage on the motor you should always get the same measurement as battery voltage, to within about 1/2 a volt. When you get large drops in voltage like you are seeing, what that means is there is corrosion in the circuit you are testing. And that corrosion is acting like an electrical resistor, causing a drop in voltage.
Are there any battery switches in the boat, or do the battery cables connect directly to each engine?
If you pull the fuse out, is there any corrosion behind it?
Do this as another test. Start the engine up and bring the RPMS up to about 1500 in neutral. Does the voltage at the fuses rise?