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Old 01 May 2007, 13:42   #1
Country: UK - England
Town: Gloucestershire
Boat name: Osprey
Make: Osprey Vipermax
Length: 5m +
Engine: E-tec 300 G2
Join Date: Dec 2006
Posts: 4,008
Charging voltage on Johnson

I have fitted a Cvolt that allows me to see the voltage across the batteries and it looks like my engine is putting out a charge voltage of around 14.75 volts which is a little on the high side. This voltage is consistent across the RPM range so clearly the regulator is working however what can I do to reduce the voltage a little?

My battery instructions say charging upto 14.8 is OK however I am nervous being so near the the top end all the time.


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Old 01 May 2007, 13:45   #2
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
Try a multimeter - maybe the reading is a little high?

Also depends on how it's wired in - does it measure close to the battery or right at the alternator? You can expect some voltage drop the longer the leads involved.

Keep you eye on the battery electrolyte levels - you will soon see if it's overcharging.

You say the voltage is consistent - it normally varies with RPM - at very low idle you should see less than that.

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Old 01 May 2007, 13:48   #3
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Country: UK - England
Town: The wilds of Wiltshire
Boat name: WhiteNoise/Dominator
Make: Ballistic 7.8/SR5.4
Length: 7m +
Engine: Opti 225/Yam 85
MMSI: 235090687/235055163
Join Date: Jul 2005
Posts: 12,552
14.8 is fine-worry if it drops or goes over 15.
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