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Old 12 May 2019, 04:52   #1
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Country: UK - Scotland
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Make: Avon SR5.4
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Yamaha 2 stroke high volts

Hi, looking for some guidance to assist my own troubleshooting:

Was out for a few hours yesterday and noticed the voltage reading (from Garmin GPS) considerably high - up to 17volts at 5000 rpm.

Once at idle, dropped back to circa 13 volts. Did a hand test on battery and no obvious hot spots (access is limited though). All electrics ok thankfully.

Just going to check battery connections clean ants tight and put voltmeter across terminals to see if itís the battery. (I figure get the easy stuff done early).

What else could it be - will check all bullet connections under the outboard hood too but if all tight. What next - new rectifier needed?

Forgot to add - Yamaha 75 CETOL 2009 autolube.

Thanks in advance for any steers.
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Old 16 May 2019, 12:53   #2
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Have you got Yam instruments? Our Yam tacho is multifunction and it gives volts. Ive noticed that the yam voltage and the garmin chart plotter voltage we have differ by 0.5 volts...the garmin reading too high. Your voltage does sound high though???
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Old 16 May 2019, 13:10   #3
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Country: UK - Scotland
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Make: Avon SR5.4
Length: 5m +
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Yamaha 2 stroke high volts

Hi. No, my gauge isnít a Yamaha and doesnít show volts but trust the garmin to be close enough I guess. Iíve got a new rectifier now, will install and see how it goes. Thanks for reply.
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Old 16 May 2019, 14:46   #4
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Yeh, i reckon the rectifier is on the way out...Keep us posted
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Old 18 May 2019, 16:36   #5
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Country: UK - Scotland
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Boat name: Gillian
Make: Avon SR5.4
Length: 5m +
Engine: Yamaha 75 CETOL
MMSI: 232011898
Join Date: Jan 2018
Posts: 27
Got it out for a run today with new rectifier on. Still showing 15.6 at 4000 rpm so Iím assuming that up at higher rpm would climb up again. Switch on lights and it came down to 13.5ish

Not sure now if I should just get a new battery in case thereís something wrong with that. Any advice gratefully received.
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