Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 27-05-2007, 10:13   #1
Senior Cruiser
 
JusDreaming's Avatar

Cruisers Forum Supporter

Join Date: Jul 2004
Location: Stuart, FL & Bahamas Cruising
Boat: Lagoon 37
Posts: 880
Images: 13
Alternator problem

a friend of ours has a catalina 34. While cruising this year his tach started acting wierd. When at idle it reads about 400 rpm, when actually the engine is at about 1000rpm. When you rev the engine the reading on the tach goes down to zero. We checked the belts and wires but saw no obvious problems
__________________

__________________
Denny and Diane
Lagoon 37
http://www.svjusdreaming.bravehost.com/
http://www.sailblogs.com/member/svjusdreaming/
"The only way to get a good crew is to marry one." -Eric Hiscock
JusDreaming is offline   Reply With Quote
Old 27-05-2007, 13:36   #2
Senior Cruiser
 
Alan Wheeler's Avatar

Cruisers Forum Supporter

Join Date: Dec 2003
Location: Marlborough Sounds. New Zealand
Boat: Hartley Tahitian 45ft. Leisure Lady
Posts: 8,038
Images: 102
It is possible the brushes need cleaning.
__________________

__________________
Wheels

For God so loved the world..........He didn't send a committee.
Alan Wheeler is offline   Reply With Quote
Old 27-05-2007, 13:54   #3
Senior Cruiser
 
JusDreaming's Avatar

Cruisers Forum Supporter

Join Date: Jul 2004
Location: Stuart, FL & Bahamas Cruising
Boat: Lagoon 37
Posts: 880
Images: 13
Quote:
Originally Posted by Alan Wheeler
It is possible the brushes need cleaning.
not sure, It seems to be charging correctly
__________________
Denny and Diane
Lagoon 37
http://www.svjusdreaming.bravehost.com/
http://www.sailblogs.com/member/svjusdreaming/
"The only way to get a good crew is to marry one." -Eric Hiscock
JusDreaming is offline   Reply With Quote
Old 27-05-2007, 15:34   #4
Senior Cruiser
 
starfish62's Avatar

Cruisers Forum Supporter

Join Date: Mar 2006
Location: Palm Beach, Florida
Boat: Gulfstar 44 Sloop
Posts: 647
Images: 4
If the tach grounds out when the engine is revved, I'd suspect the tach itself. Check the connections to the tach (any corrosion at all should be cleaned up--some 400-600 wet/dry sandpaper) and then hit it with some CRC & try it again.
__________________
Starfish
starfish62 is offline   Reply With Quote
Old 27-05-2007, 15:41   #5
Senior Cruiser
 
starfish62's Avatar

Cruisers Forum Supporter

Join Date: Mar 2006
Location: Palm Beach, Florida
Boat: Gulfstar 44 Sloop
Posts: 647
Images: 4
If the tach grounds out when the engine is revved, I'd suspect the tach itself. Check the connections to the tach (any corrosion at all should be cleaned up--some 400-600 wet/dry sandpaper) and then hit it with some CRC & try it again. You can hotwire the tach to see if the guage is working. I think you should be able to take your lead to the block and put it to ground (engine NOT running, batteries to off) and the tach should peg at max. At least then you'll know that the guage is good.
__________________
Starfish
starfish62 is offline   Reply With Quote
Reply

Tags
alternator

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 07:29.


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.