I've got a question about the trim position sending unit on my old 88 Thundercraft stern drive. My trim gauge seems to not work at all, so last night I started to investigate.
I removed the 2 small bolts that secure the trim sending unit to the gimbal housing and pulled it out to test the resistance. With an ohm meter at the plug inside the engine compartment, I get readings from 0 to 198 ohms, which according to the manual is perfect.
However, when I went to re-install it, I got confused. On the trim sending unit is a plastic arm which appears that it should be hooked up to or at least rubbing on something to direct the arm up and down as the drive moves, yet, when I re-install it, there is absolutely NOTHING touching it. Should there be a linkage between this plastic arm and the drive, or should it touch the drive and be directed up and down? I must be missing a part or a cable or something. Maybe this is why the gauge does not work. It is up in the red zone all the time.
I removed the 2 small bolts that secure the trim sending unit to the gimbal housing and pulled it out to test the resistance. With an ohm meter at the plug inside the engine compartment, I get readings from 0 to 198 ohms, which according to the manual is perfect.
However, when I went to re-install it, I got confused. On the trim sending unit is a plastic arm which appears that it should be hooked up to or at least rubbing on something to direct the arm up and down as the drive moves, yet, when I re-install it, there is absolutely NOTHING touching it. Should there be a linkage between this plastic arm and the drive, or should it touch the drive and be directed up and down? I must be missing a part or a cable or something. Maybe this is why the gauge does not work. It is up in the red zone all the time.