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Voltage

Old 07-15-2013, 02:37 PM
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Default Voltage

I have GW 282 and I am loosing one volt from the battery to the helm. All the connections are corrosion free. Is this normal because I had the battery's at 12.7 V and the chart plotter was shutting down by it self.;?
Old 07-15-2013, 04:32 PM
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Not normal. Check the wire size. Does sound like a bad breaker or a pinched wire etc.
Old 07-15-2013, 07:43 PM
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Is this only when you start the engine? I always advocate a separate house bank in any boat which is more than a simple skiff. If the battery voltage is 12.7, the helm voltage should be 12.7. However, some engines will lower the voltage to 9 or so volts during cranking. If that is the case, then a separate electronics-house battery is in order. VSR to charge that battery.
Old 07-16-2013, 07:00 AM
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Originally Posted by thataway View Post
Is this only when you start the engine? I always advocate a separate house bank in any boat which is more than a simple skiff. If the battery voltage is 12.7, the helm voltage should be 12.7. However, some engines will lower the voltage to 9 or so volts during cranking. If that is the case, then a separate electronics-house battery is in order. VSR to charge that battery.
I loose 1 volt just by turning the key w/out any cranking.
Old 07-16-2013, 07:31 AM
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Take a volt meter with an extension on one lead as needed, and starting from the battery measure the voltage across each item in the chain, screw terminals, crimp terminals, selector switch, breaker, each end of each piece of wire etc. Look for the places were voltage is being lost to find the culprit.
Old 07-16-2013, 01:47 PM
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Originally Posted by jpwiechern View Post
I loose 1 volt just by turning the key w/out any cranking.
That's pretty bad. Go back to where the batteries and battery cable terminals are. Tug at them by hand and make sure nothing is loose. Look to see if there is any sign of plastic around the terminal having been melted or heated. Then do the same with whatever terminals bring power to where you are measuring. You should never have such a deep voltage drop unless the battery is bad or the terminals are loose.

BTW, when I had a larger boat, that was one of the safety checks I did before launching. And indeed caught the bolts having come lose and the terminals almost melted from my house battery bank!
Old 07-16-2013, 07:04 PM
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Originally Posted by amirm View Post
That's pretty bad. Go back to where the batteries and battery cable terminals are. Tug at them by hand and make sure nothing is loose. Look to see if there is any sign of plastic around the terminal having been melted or heated. Then do the same with whatever terminals bring power to where you are measuring. You should never have such a deep voltage drop unless the battery is bad or the terminals are loose.

BTW, when I had a larger boat, that was one of the safety checks I did before launching. And indeed caught the bolts having come lose and the terminals almost melted from my house battery bank!
OK guys, I feel pretty stupid. After checking all the connectors again including the Batt. selector switch I found a ground cable that did not get hooked up after I replaced the batteries. I do thank you guys for your the help.

Thx Jurgen

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