Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 25-03-2012, 22:39   #16
Registered User

Join Date: May 2011
Posts: 132
Re: Bouncing Tach Needle

A long time ago a friend had the same problem on his sailboat. I solved it by jumping a small dash light bulb around the voltage regulator. This kept a small field current through the alternator. He reported back that it cured the jumping needle and did not cause excessive charging. Just my two cents, Mike.
__________________

__________________
Florida Mike is offline   Reply With Quote
Old 25-03-2012, 22:42   #17
Marine Service Provider

Join Date: Oct 2007
Boat: Endeavour 42CC
Posts: 1,182
The fix did not work, needle still bouncing.
I don't understand the bulb fix, please elaborate? Where did you wire it?
__________________

__________________
gettinthere is offline   Reply With Quote
Old 26-03-2012, 11:35   #18
Registered User

Join Date: May 2011
Posts: 132
Re: Bouncing Tach Needle

The bulb was wired around the regulator. It came from the switch positive lead that fed the regulator to the field terminal on the regulator. What this accomplishes is maintaining a small field current to the alternator which keeps the alternator charging slightly as in 1 to 3 amps. In this particular case the voltage regulator with external. It happened to be an old Chrysler regulator running a GM alternator. Just my two cents, Mike.
__________________
Florida Mike is offline   Reply With Quote
Old 27-03-2012, 08:45   #19
Marine Service Provider

Join Date: Oct 2007
Boat: Endeavour 42CC
Posts: 1,182
Re: Bouncing Tach Needle

Mike
It sounds like you needed the bulb to keep a small load on the alternator. I'm having this issue when the batteries are in need of charge, so there is a draw from the batteries? Plus, chart plotter, radio, etc are running, creating a draw.
wouldn't this negate your idea as a solution for me?
thanks
__________________
gettinthere is offline   Reply With Quote
Old 27-03-2012, 15:31   #20
Registered User

Join Date: Jan 2012
Posts: 101
Re: Bouncing Tach Needle

balmar regulators have a spot where you run your tac wire thru the regulator. takes care of the problem
__________________
tuberider is offline   Reply With Quote
Old 27-03-2012, 16:01   #21
Marine Service Provider

Join Date: Oct 2007
Boat: Endeavour 42CC
Posts: 1,182
Re: Bouncing Tach Needle

...But the system ran fine for a while as is. Then started this problem. I suspect it has to be a bad ground, just haven't found it.
__________________
gettinthere is offline   Reply With Quote
Old 29-03-2012, 13:30   #22
Registered User

Join Date: May 2011
Posts: 132
Re: Bouncing Tach Needle

The light bulb act as a resistor to maintain a small field current so that the alternator never turns off completely. Remember that the positive input to the bulb does need to be switched with the alternator. Remember your charge controller told you that the alternator was not charging when the tach, was not working. What this will do is make it so that the alternator never completely stopped working. I hope this clears a little bit of the mud is not contact me off board and I can call you and explain better. Good luck, Mike.
__________________

__________________
Florida Mike 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
Bouncing Tach Needle gettinthere Electrical: Batteries, Generators & Solar 21 29-03-2012 13:30
Vetus Tach for Yamaha Outboard Sailorman Ed Engines and Propulsion Systems 0 05-12-2011 19:02
Yanmar Tachometer Bouncing . . . Replacement ? akio.kanemoto Engines and Propulsion Systems 18 12-11-2011 15:12
Alternator Light On and Tach Out duefocena Electrical: Batteries, Generators & Solar 16 19-09-2011 20:55
Tach Problem captain465 Engines and Propulsion Systems 8 19-08-2011 02:24



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 23:20.


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.