Yamaha Trim Gauges

primetime

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I have twin 150 Yamahas. I can trim both engines but one of my trim indicator gauges does not work. Does anyone know a quick troubleshooting method to check this out.
 

freddy063

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a first easy check, raise both motors and find the plastic foot that moves on the motor that reads the trim, and move them by man while someone is watch the gauge.See if ithey both work, if not check starting from that sensor/foot wireing at motor and at gauge.