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08-15-2010, 03:41 PM #1Junior Member
- Join Date
- May 2010
- Posts
- 4
New Alternator putting out 11.8volts?
2002 Moomba Outback V
310 Indmar TBI
I replaced my alternator because I kept draining getting low voltage. I installed the new alternator and it still is putting out 11.8 volts. I have tested both batteries and they are fine. I noticed that the purple and red wire that plug into the regulator on the back on the alternator shows 12volts before I turn on the ignition, but when I turn the ignition to the on position the voltage drops to nothing. I am not sure if this is wrong or not but if it is what could be the culprit and what should i check??
any advise helps
thank you.
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08-15-2010, 06:28 PM #2Senior Member
- Join Date
- Jan 2008
- Location
- Pensacola, FL
- Posts
- 1,585
What is the voltage output of the alternator when the engine is running at idle? and at about 2000 rpm?
That info is needed.1997 MasterCraft 205
2008 Moomba Outback
1999 MasterCraft Sportstar OB
1992 MasterCraft 205
1999 Malibu Response LX
1987 Marlin Magnum Skier
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08-15-2010, 10:37 PM #3Junior Member
- Join Date
- May 2010
- Posts
- 4
at idle it is putting out 11.8 to 11.9, and then at about 2500rpm it drops to 11.7 to 11.5
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08-16-2010, 12:47 PM #4
Are you sure that you aren't running the boat solely off the batteries at this point which would draw more current at higher rpms and thereby reduce the voltage?
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08-17-2010, 09:35 PM #5
I had somewhat the same issue until I put every component of my audio on the exact same ground (engine ground). I had multiCD unit, head unit, iPod box, two amps, all hooked to the same ground. Before I had them near each other and noticed I wasnt getting as much from my alternator. Just my 2 cents.
Jim Hagen
Madison, Wisconsin
facebook.com/signedgewraps
2011 Moomba Mobius LSV - Exiled
2002 Moomba Mobius LSV - Sold
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08-18-2010, 12:10 AM #6
check your hoses make sure the belt isn't getting wet and slipping I had a similar problem found small holes in the J hose that goes from the water pump to the thermostat
mastercraft dealer had 5 in stock so I would assume its a common problem
also check the belt its self for abnormal wear if it is getting wet2007 Outback V