Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 10-11-2009, 09:11   #1
Moderator
 
Dockhead's Avatar

Cruisers Forum Supporter

Join Date: Mar 2009
Location: Cowes (Winter), Baltic (Summer) (the boat!); somewhere in the air (me!)
Boat: Cutter-Rigged Moody 54
Posts: 19,751
How to Test Charging System?

Our boat has a separate 12v alternator charging the starting battery, and a big-azz 100 amp 24v alternator charging the house and service batteries.

I don't think power from the 100-amp alternator is getting to the house and service banks. Batteries seem to be low after a trip, even after a couple of hours of motoring. And I see a "no charge" or "low charge" warning light sometimes while motoring.

How can I test the alternator, and the regulator, to see what the problem is? Is there an accepted procedure for doing this?

Thanks guys.
__________________

__________________
Dockhead is offline   Reply With Quote
Old 10-11-2009, 09:27   #2
Moderator Emeritus
 
GordMay's Avatar

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 31,585
Images: 240
See post #1 at
BASIC Alternator Testing
__________________

__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is online now   Reply With Quote
Old 10-11-2009, 09:37   #3
Senior Cruiser

Cruisers Forum Supporter

Join Date: Mar 2007
Location: Santa Cruz
Boat: Boatless Again
Posts: 4,331
Buy Nigel Calder's book 'Boatowners Mechanical and Electrical Manual'--you may not always have an internet connection when you have a problem, and he does a good job of the procedure for testing the charging system, as well as most other systems on the boat.

The short answer is "what is the voltage across the battery bank(s) when the engine is/is not running? If the voltage does not rise after you start the engine, you have a problem with the 24v charging system--it should be 26-28v with the engine going.
__________________
donradcliffe is offline   Reply With Quote
Old 10-11-2009, 09:42   #4
Moderator
 
Dockhead's Avatar

Cruisers Forum Supporter

Join Date: Mar 2009
Location: Cowes (Winter), Baltic (Summer) (the boat!); somewhere in the air (me!)
Boat: Cutter-Rigged Moody 54
Posts: 19,751
Thanks very much. I do have Calder's book! It's on the boat. I'll use it for this. Cheers.
__________________
Dockhead is offline   Reply With Quote
Old 10-11-2009, 10:57   #5
Moderator
 
Dockhead's Avatar

Cruisers Forum Supporter

Join Date: Mar 2009
Location: Cowes (Winter), Baltic (Summer) (the boat!); somewhere in the air (me!)
Boat: Cutter-Rigged Moody 54
Posts: 19,751
And thanks Gord for your excellent paper. I have printed it and will take it on board.
__________________
Dockhead is offline   Reply With Quote
Reply

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
charging system question Rhosyn Mor Electrical: Batteries, Generators & Solar 6 15-02-2009 11:55
New Boats Charging System AnchorageGuy Electrical: Batteries, Generators & Solar 11 21-11-2008 22:10
How do I test charging with only a Multimeter? MarkJ Electrical: Batteries, Generators & Solar 73 18-09-2008 17:11
Outboard charging system Ted Beyer Electrical: Batteries, Generators & Solar 2 21-06-2005 18:33



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 04:46.


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.