I also had a problem with the bowthruster when first fitted the rubber inside was the wrong one it would work sometimes but labored the engine at any revs had to have a replacement after lots of hassle with ARS
Hi I have the same engine and bow thruster in my boat and have had the same problem, found it was the alternator a 75amp 24v when batterys bit low if you used the bow thruster at tick over revs dropped well down, the engine just has not got enough power at low revs to power prop. alternator and bowthuster a smaller pulley on alternator helped a bit
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