Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 02-10-2012, 08:38   #1
LJH
Registered User

Join Date: Mar 2012
Location: Nova Scotia
Boat: Wauquiez Centurion 42
Posts: 274
Trouble charging batteries from alternator

My batteries have stopped accepting a charge or my alternator has quit. I have AGM house battery bank that ran down while I was away from our boat for an extended period of time. They are about 50% charged. When I ran the engine there was no voltage rise and the batteries showed a dicharge. The voltage regulator is providing field voltage. The alternator is a Balmar 70-110 that has less than 500 hours in service and not showing any output!. The belt tension appears good and the belt shows no abnormal signs of ware. I replaced the alternator with a Bamar 95-70 and still no output! Two bad alternators in a row!
__________________

__________________
LJH is offline   Reply With Quote
Old 02-10-2012, 09:02   #2
Senior Cruiser
 
Captain Bill's Avatar

Cruisers Forum Supporter

Join Date: Apr 2008
Location: On the boat
Boat: Endeavourcat Sailcat 44
Posts: 2,313
Re: Trouble charging batteries from alternator

Where are you measuring the output at the alternator or the battery. I would suspect a bad wire either the field connection is not getting any voltage or the output wire is bad, if you are measuring at the battery.

Another possibility is if you have a switch between the alternator and the battery perhaps it has gone bad.
__________________

__________________
Captain Bill is offline   Reply With Quote
Old 02-10-2012, 09:13   #3
Senior Cruiser
 
Vasco's Avatar

Cruisers Forum Supporter

Join Date: Apr 2004
Location: Toronto
Boat: CS36Merlin, "La Belle Aurore" Ben393 "Breathless"
Posts: 7,140
Re: Trouble charging batteries from alternator

Have you checked the regulator? This alternator takes an external regulator.
__________________
Rick I
Toronto in summer, Bahamas in winter.
http://groups.yahoo.com/group/beneteau393/
Vasco is offline   Reply With Quote
Old 03-10-2012, 04:13   #4
LJH
Registered User

Join Date: Mar 2012
Location: Nova Scotia
Boat: Wauquiez Centurion 42
Posts: 274
Re: Trouble charging batteries from alternator

Quote:
Originally Posted by Captain Bill View Post
Where are you measuring the output at the alternator or the battery. I would suspect a bad wire either the field connection is not getting any voltage or the output wire is bad, if you are measuring at the battery.

Another possibility is if you have a switch between the alternator and the battery perhaps it has gone bad.
With the field voltage set at 12.8V from Start Bat, I measured Alt+ to Alt-, Bat+ to Bat-, Alt+ to Bat- and Bat+ to Alt- All we 12V. No measurable voltage drop across the Alternator shunt. If I put an isolating diode between the alternator and the battery bank the measurements are Alt+ to Alt- and Alt+to Bat- 12.6V,
Bat+ to Bat- and Bat+ to Alt- were 12V. Voltage drop measured across the diode as .6 volts. So voltage at the alternator, but no current flow.
__________________
LJH is offline   Reply With Quote
Old 03-10-2012, 09:55   #5
LJH
Registered User

Join Date: Mar 2012
Location: Nova Scotia
Boat: Wauquiez Centurion 42
Posts: 274
Re: Trouble charging batteries from alternator

After another day's troubleshooting, it turned out to be a faulty cable.

Thanks for your help guys.
__________________
LJH is offline   Reply With Quote
Reply

Tags
alternator, charging

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 13:20.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.