Tachometer testing - 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 10-09-2009
Member
 
Join Date: Sep 2006
Location: Tampa, FL
Posts: 69
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
JLBJR is on a distinguished road
Tachometer testing

Is there any way to test a tachometer? I have replaced the alternator and it had a tach wire out the rear. I found the send wire from the tach in the engine wiring harness by doing a continuity test and connected them together. The needle does not move. BTW, the tach, which has never been connected, is sitting at about 700RPM, not zero. My thought is that the tach is bad, but hate to simply swap parts only to find out it was something else. I have read other tach posts, but none I have found refer to tachometer testing.

Thanks
Reply With Quote Quick reply to this message Share with Facebook
  #2  
Old 10-09-2009
Senior Member
 
Join Date: Jul 2008
Location: Hershey, PA
Posts: 137
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 7
harbin2 is on a distinguished road
Yea, testing is the way to go. My fuel gauge reads near half when the ignition switch is off and fairly accurately when it is on.
If your engine has spark plugs you can get a simple auto tack tester. They are cheap. If it's diesel, there is an piece of electronic test equipment that will do the same thing but without a sync wire - try google.
harbin2
Reply With Quote Quick reply to this message Share with Facebook
  #3  
Old 10-10-2009
timebandit's Avatar
Senior Member
 
Join Date: Sep 2002
Posts: 928
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 13
timebandit is on a distinguished road
Inside the alt. is a pulser coil that can be checked by conecting the wires to a analog meter set to low voltage.

if the alt. is sending you should see the needle just bounce at cranking speeds.

If the needle moves when you check it and then you hook up the tack and the tack does not work then you need a need a new tach.
__________________
Rick
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Mac 25
Copernicus
Southern California
I am not a prejudice racist sexist bigot. I just hate stupid people.
Reply With Quote Quick reply to this message Share with Facebook
  #4  
Old 10-10-2009
Member
 
Join Date: Sep 2006
Location: Tampa, FL
Posts: 69
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 9
JLBJR is on a distinguished road
Excellent advise. I have my multimeter and I am ready to go check for a pulse!

Thanks.
Reply With Quote Quick reply to this message Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




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
tachometer retrofit for Yanmar YSM-12 Kabloona Gear & Maintenance 0 02-07-2007 03:50 PM
Tachometer morganbill Gear & Maintenance 2 02-02-2007 02:57 PM
South Africa: Testing Times for Tito And His Team (AllAfrica.com) NewsReader News Feeds 0 10-09-2006 04:15 PM
Tachometer not working?? bderosa Gear & Maintenance 4 08-02-2006 09:08 PM
diesel tachometer diesel MHRitter Gear & Maintenance 1 09-17-2002 12:52 PM


All times are GMT -4. The time now is 06:33 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.