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Honda BF150 side mount controls indicator light test

MrHairyBugger

New member
Hi,

I have a BF150 with a side mount throttle. When I start the engine, I hear 2 test beeps from the buzzer and both lights illuminate (Green oil pressure and red overtemp), then the buzzer stops, but the 2 lights both stay on.
As far as I understand, the green light should stay on, and the red should go off. There is no buzzer noise anymore and I get this state as I start the engine from cold, so it can't be a real overheat. So I suspected wiring.

I removed the indicator light unit from the controls and tested it according to the test procedure in the service manual:

2025-04-01 13_41_50-Window.png


I connected grey to 12v. When I connect black to ground, I get green on [expected]. When I connect 2 and 3 to ground I get RED on [unexpected] . When I connect 2 to ground I get red on [expected].
So it looks like the indicator light unit is faulty. That the yellow line has a fault on it?

I would like to check with you guys if any of you have tested this indicator unit before? Do you get only green on with 2+3 connected [as expected in manual]? I ask as replacing the unit is not cheap, and getting the part will also be difficult. Otherwise has anyone opened the indicator unit (resin sealed) and had a poke around inside there? I might be able to repair it if anyone has an idea of how it works.

Thanks
Hairy
 
Hi mate.... I'm having the same problems! Any luck on your end? Have you sorted it out? Can you tell me please?

Sorry for the bad photo, but you can see the red light in the control box. I am underway when I took this photo, and no audible alarm. NMEA 2000 temp gauge indicates normal operating temperature @ around 80 deg C.

1744444343571.png



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