Voltage Out Put

[Wntcrazy]

Having some trouble with House battery, I have replaced most all of my lights with LED's. Battery kept going down, checked all circuits for shorts etc.
Got to the alternator on the outboard, A honda 9.9. and with the leads off of the battery and connected to a V/O meter I am reading 25/30 volts DC. sounds high to me, any suggestions.

 

[Joe11688]

Having some trouble with House battery, I have replaced most all of my lights with LED's. Battery kept going down, checked all circuits for shorts etc.
Got to the alternator on the outboard, A honda 9.9. and with the leads off of the battery and connected to a V/O meter I am reading 25/30 volts DC. sounds high to me, any suggestions.

If you're getting that kind of voltage from the outboard charging system, it's probably boiling the electrolyte out of your battery. You should be getting around 12.5 to 13 Volt readings. Check and see if the ground is good coming from the outboard. A bad ground can cause high voltage. Take the charging system ground off the battery and check for continuity back to the metal on the outboard.

 

[kdssail]

battery drain

try recharging your battery OFF the boat and then reinstall it WITHOUT the outboard hooked up. run your light and do as you have been doing to "discharge" the battery. This will seperate the engine from the boat. Also have the battery checked to see if it has a bad cell that would not allow it to recharge all the way. Try seperating different areas of the boat to narrow down the "area" of problem. If the battery checks good and with the engine disconnected, the battery last a long time then the problem area is the engine and/or its wiring. A good battery will read 14.2 volts DC, any reading down around the 12 to high 12 volt range and the battery is NOT charged. Contrary to words a 12 volt DC system really needs 13.8 to 14.2 to be considered good.