An alternator quickie... - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance
 Not a Member? 
  #1  
Old 10-17-2011
SVPrairieRose's Avatar
Senior Member
 
Join Date: Oct 2009
Location: Vancouver BC
Posts: 227
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 5
SVPrairieRose is on a distinguished road
An alternator quickie...

Hey guys, looking for some quick advice here. I am almost half way to mexico and I am stuck in San Fran with a compounding list of issues, one of which is about to fly home if her boat isn't fixed soon!

The alternator is where I need a bit of help. It no longer puts out any charge at a low idle -600rpm, and puts out a very varied charge (60-90amps) at operating rpms.

it is an externally regulated 140amp alternator with a xantrex regulator.

Any advice would be appreciated, thanks guys.

Rob.
Reply With Quote Share with Facebook
  #2  
Old 10-17-2011
Junior Member
 
Join Date: Oct 2011
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
dkenny is on a distinguished road
you might have lost a diode. or a brush might be sticking(not making full contact)
what's the output voltage?

-dkenny
Reply With Quote Share with Facebook
  #3  
Old 11-21-2011
NICHOLSON58's Avatar
Mark on Camper 58
 
Join Date: Feb 2009
Location: Grand Rapids Michigan
Posts: 197
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 6
NICHOLSON58 is on a distinguished road
I found our alternator not putting out. 14 of 16 diodes were fried as was the regulator. I had the alt rebuilt at a truck alternator and starter repair shop for 68 bucks. We replaced the regulator with Balmar. Problems gone. I assume lighting strike. Lots of other electronics were dodgy too. Presented an opportunity to upgrade a lot of toys.
Reply With Quote Share with Facebook
  #4  
Old 11-22-2011
TQA's Avatar
TQA TQA is offline
Bombay Explorer 44
 
Join Date: Apr 2009
Posts: 2,575
Thanks: 0
Thanked 47 Times in 43 Posts
Rep Power: 6
TQA is on a distinguished road
Any decent alternator repair shop can test run the alternator on a rig and see if under full field current conditions it is giving it's rated output and if it is steady.

If it is then your belt [s] might be slipping.

Last port of call would be the regulator they usually work or fail completely.

Why not get a basic auto alternator with internal regulator as a back up and GO!
Reply With Quote Share with Facebook
  #5  
Old 11-22-2011
ebs001's Avatar
Senior Member
 
Join Date: May 2006
Location: Ottawa, Canada
Posts: 2,140
Thanks: 5
Thanked 21 Times in 19 Posts
Rep Power: 9
ebs001 is on a distinguished road
First thing to do is to check your fan belt. If it's glossy that is probably your problem. Check the tighness too. After that if you have a Balmar call their service department. They will walk you through some test that you can do with the alternator still attached to the engine and test the regulator. If that yields nothing then a repair shop is your next step. A basic auto alternator is a good back-up as suggested above.
Reply With Quote Share with Facebook
  #6  
Old 11-22-2011
LakeSuperiorGeezer's Avatar
Senior Member
 
Join Date: Oct 2010
Posts: 551
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 4
LakeSuperiorGeezer is on a distinguished road
The fact that amps varies may not be a problem. Put a digital volt meter on it and see if the voltage is constant. However, no amps at idle points to a diode problem as would low voltage.
Reply With Quote Share with Facebook
  #7  
Old 11-25-2011
Senior Member
 
Join Date: Oct 2011
Location: Naniamo B.C.
Posts: 1,793
Thanks: 2
Thanked 27 Times in 27 Posts
Rep Power: 3
Capt Len is on a distinguished road
It takes about half an hour to switch them so put on the spares and take the suspects to a shop for any necessary work But check the belts or replace from stores before going to this effort or to sea .
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
alternator nelsonsmoody Gear & Maintenance 7 08-29-2008 02:32 PM
Quickie Weather alert for East Coasties: camaraderie General Discussion (sailing related) 57 09-10-2007 12:18 AM
Stuffing Box Quickie - Grease clayjay Gear & Maintenance 1 08-10-2007 09:18 AM
Yes, alternator, Some others NewsReader Mass Bay Sailors 0 02-06-2007 12:15 AM
alternator help. hwkmoon Gear & Maintenance 1 12-26-2000 04:12 AM


All times are GMT -4. The time now is 07:51 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.