Re: [Amel Yacht Owners] Bow Thuster Control Box

Ryan Meador

I made two assumptions that are perhaps incorrect: I assumed that the lights share a buzzer via a pair of diodes at the helm, thus if a light is on, the buzzer is also on; and I assumed that the sensors cut power to the up/down motor at the same time they activate the light/buzzer.  I think I have seen such circuitry for the former in my boat, but who knows if it is original or if I'm remembering correctly.  Does anyone have electrical schematics for this whole system?  I don't believe it is in the pile of schematics I have, but I will try to remember to check.  It is not doing anything complicated, so we should be able to reverse engineer it even if we can't figure out how the old ones work.  Maybe I'll create a schematic this weekend if nobody has one already.

SM 233 Iteration
Boston, MA, USA

On Fri, Dec 1, 2017 at 12:28 PM, Danny and Yvonne SIMMS simms@... [amelyachtowners] <amelyachtowners@...> wrote:


Hi Chuck,

on SM 299 the bow thruster has sensors clamped to the ram that lifts and lowers the thruster. These need to be properly positioned. The clamps can be loosened and the (little oblong black boxes) moved up or down as they set the start and stop points. Position by trial and error. 


Danny SM 299 Ocean Pearl

On 01 December 2017 at 11:00 "clacey9@... [amelyachtowners]" <> wrote:



Hi All,

I have been stricken with the dreaded bow thruster burn up! This has happened to a few of you so I am reaching out because we are stuck for a fix. The usual story - Hole in BT is sitting slightly higher than the pin-lock. The up-sensor was a bit erratic and probably allowed the BT to go up to high and jamming the up-down rod. My model does not have a fuse and sure enough we burnt up the motor. I now have a shiny new fabriqué en France motor and it is installed. When commanding the motor to go up from the helm it goes up. When commanding to go down it buzzes like it is already down. Rod does not move down. We are thinking it is one of the orange relays on the circuit board. We changed the diodes out to be sure it was not them. Does that sound right? Any ideas would be appreciated. We are trying to leave and this is keeping us dockside. Thanks in advance.


s/v Joy

SM2K #388




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