20 years without knowing, So I thought I'd ask. - Page 5 - 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 > Engines > Diesel
 Not a Member? 

Diesel This is a new forum dedicated to diesel engines and their applicable accessories.


Like Tree1Likes
Reply
 
LinkBack Thread Tools
  #41  
Old 12-10-2011
Senior Member
 
Join Date: Jul 2007
Location: Truckee, CA
Posts: 6,719
Thanks: 2
Thanked 95 Times in 93 Posts
Rep Power: 7
dabnis is on a distinguished road
Quote:
Originally Posted by Rockter View Post
Dan,

Many ships, like mine, need a live ignition to excite the alternator rotor. I have one of those early, and reliable, Ample Power regulators from 1992.

If I turn the ignition off though, I simply do not charge.

I am puzzled as to how any other system would work? How would the alternator be regulated without a power supply? How would it charge?

I don't think it does any harm to my system to turn it off when engine is running, but I simply try never to do it. It has happened every now and again. All that happens is that the alternator amperage just drops to zero.
.
From an earlier post:

#19 (permalink) 3 Weeks Ago - Add Post To Favorites
dabnis
Senior Member Join Date: Jul 2007
Posts: 528
Rep Power: 5


Quote:
Originally Posted by casey1999
The Yanmar manual states (and I think most engine manuals) the alternator can be damaged (rectifier I think gets damaged) if the alternator is disconnected from the battery when the alternator is spinning. Can this happen even if your alternator is self exciting? How is the rectifier actually damaged?

Two possibilities, I think?

1. If the alternator doesn't "see" battery it won't charge, no damage?

2. If it "sees" battery and tries to charge into a "no load" condition the diodes, (rectifier) can be damaged?

By mistake I ran an alternator "open" for a short time and got away with it. from what I have read I was lucky.

Dabnis
Reply With Quote Share with Facebook
  #42  
Old 12-10-2011
Senior Member
 
Join Date: Oct 2011
Location: Victoria b.c.
Posts: 1,459
Thanks: 2
Thanked 15 Times in 15 Posts
Rep Power: 3
Capt Len is on a distinguished road
As an aside to the potential damage to alternator, turning the key off prematurely will turn off oil alarm .So now you pull the stop cord or whatever you have. No way of knowing if engine has actually stopped what with all the partying going on in the cockpit and you release the cord early.Engine gives it's last gasp and bounces on compression sucking salt water into cylinder from manifold, bending one or more con rods I can hear you say "'Only an idiot would do that!" Fortunately the insurgency company paid me for my time and parts and the bruises on my butt are finally fading.
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
Good Years and Bad Years MooreVOLS Boat Review and Purchase Forum 7 08-26-2010 11:04 AM
your boat for 2 years, my house for 2 years wantogonow Cruising & Liveaboard Forum 0 08-27-2009 04:42 PM


All times are GMT -4. The time now is 05:19 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