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Old 18-05-2019, 17:54   #1
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Karanga's Avatar

Join Date: Jun 2018
Location: NZ/Aus
Boat: Crowther 85 Catamaran
Posts: 146
Autopilot conversion - Benmar to TMQ

I have Benmar 210 Course Keeper running ok on my sailing cat. Very old school, but functional.
I have a slightly used TMQ AP4 control unit and compass sitting on the shelf and am wondering how to swap it in.
From what I can see, the main issue might be the clutch. The Benmar apparently has an electronic clutch, and turning the wheel to steer is possible without disengaging the auto. The unit just returns to the original set heading after a few seconds.
The TMQ unit has pinouts for motor (tested at 8 volts which matches the requirement for the hydraulic pump) and for clutch. The pump motor controller has no input for clutch. So I don't know what is required or what is possible. I suppose the unit could be put in standby or off, when wanting/needing to hand steer?

Does anyone have experience of these two systems, and their possible interchangeability?

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