R27-OB Thruster mystery

thargett

thargett

Member
Joined
Jan 12, 2026
Messages
8
I have a new to me 2023 RT27 with the bow thruster and a stern thruster mounted on the 300hp Yamaha.

I used the thrusters to leave to dock where it had been charging on shore power - they worked fine. When we returned to the dock after a 45 minute ride, the thrusters would not turn on. The little blue power light did not enable and no beeping sound.

This is the second time my thrusters failed me as I'm trying to dock with the wind pushing me off the dock. I would have thought the engines would have charged the thruster battery bank.

Has this happened to anyone else? I suspect a problem charging from the engine alternator ....

Thanks
 
Wait, you have an external 300 Yamaha, AND a stern thruster?
 
gregc said:
Wait, you have an external 300 Yamaha, AND a stern thruster?
Click to expand...

Here's what it looks like. It's designed to be out of the water when the boat's up on plane.

IMG_6838.jpg


IMG_4508.jpg
 
thargett said:
Yes that's exactly like mine. Have you had any issues with mysterious thruster behavior?
Click to expand...

That's not a photo of my boat. I don't have the need for a stern thruster on my R27.
 
I just checked the big thruster fuse on the port side rear. It's fine, and there is an LED voltmeter after the fuse that reads 12.8 volts. The receiver for the side thruster is blinking, and the transmitter behind the head mirror is also blinking. The unit at the helm will not power on. What am I missing?
 
Oh wow, this is crazy. Are both the bow and stern thrusters off the same battery?
 
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