SailNet Community - Reply to Topic

   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 > Electrical Systems > Beta Marine BD722 Tach kicks in after I enable extractor fan!
 Not a Member? 


Thread: Beta Marine BD722 Tach kicks in after I enable extractor fan! Reply to Thread
Title:
  

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

Message:
Trackback:
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:
 

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.



Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Additional Options
Miscellaneous Options

Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Topic Review (Newest First)
02-23-2013 05:57 PM
jaybeegee
Re: Beta Marine BD722 Tach kicks in after I enable extractor fan!

thanks for that Opie. Only last week I had a problem with the alternator and needed to replace the internal regulator and the brushes. I have now rewired the connections from/to the tach and whilst testing the engine on her berth the problem did not evidence itself again! But I will need to see how it goes after my fiest outing. thanks again.
02-17-2013 09:20 PM
Opie91
Re: Beta Marine BD722 Tach kicks in after I enable extractor fan!

The tack wire on the BD722 is on the alternator. A similar thing happened to me. Check the connection.
01-25-2013 03:21 PM
Stu Jackson
Re: Beta Marine BD722 Tach kicks in after I enable extractor fan!

If/when anything electrical happens randomly, it is 99% of the time the connections, just like Brian said. You should go check them out, because otherwise all the discussion on this topic will not be able to help you. Good luck. Oh, while you're at it, draw a wiring diagram, might help you and us understand things better.
01-25-2013 07:51 AM
jaybeegee
Re: Beta Marine BD722 Tach kicks in after I enable extractor fan!

apologies for the delay to respond to this thread which I missed! no it is just the extractor fan that seems to trigger the tach to mark the revs correctly. So if i switch on the lighting or the fridge I notice the engine rev up very slightly and a corresponding minimal increase in the tach! However with the fan if the tach is marking a wrong amount (say 500rpm when I am a cruising speed of 4knots) it will go from an incorrect reading of to a correct reading of 2500rpm! Not sure if I mentioned this earlier in the thread but this issue happens randomly!
05-09-2012 04:34 PM
SaltyHog
Re: Beta Marine BD722 Tach kicks in after I enable extractor fan!

It's likely that the alternator is providing the (RPM) signal to the tach. If your batteries are all charged up and there is no other load on the alternator, the alternator regulator removes the field from the alternator. No field, no tach signal. As soon as you add a load, alternator is back on and the tach then works. Just a theory. Will switching on any other load make the tach operate? (Say, the fresh water pump?)
05-09-2012 03:56 PM
jaybeegee
Re: Beta Marine BD722 Tach kicks in after I enable extractor fan!

thanks - will do yet another pass on the electrics. thanks for taking the time.
05-09-2012 01:10 PM
mitiempo
Re: Beta Marine BD722 Tach kicks in after I enable extractor fan!

Quote:
Originally Posted by jaybeegee View Post
thanks Brian - I dont think it is a wiring problem as in idle mode (or low revs) the tach works properly!

Would this behaviour evidence itself if I have the alternator belt too tight? I dont have the tension instrument but looks and feels ok with less than an inch of slack?

thanks

jay
You didn't originally say the tach works at idle. As it is an electric tach it has to be wiring - possibly corrosion of a connector.
05-09-2012 06:20 AM
Rockter
Re: Beta Marine BD722 Tach kicks in after I enable extractor fan!

Jaybee :

It is very unlikely to have anything to do with the alternator belt tension.
05-09-2012 05:48 AM
jaybeegee
Re: Beta Marine BD722 Tach kicks in after I enable extractor fan!

thanks Brian - I dont think it is a wiring problem as in idle mode (or low revs) the tach works properly!

Would this behaviour evidence itself if I have the alternator belt too tight? I dont have the tension instrument but looks and feels ok with less than an inch of slack?

thanks

jay
05-08-2012 12:37 AM
mitiempo
Re: Beta Marine BD722 Tach kicks in after I enable extractor fan!

Jay

The tach needs a 12 volt feed that is ignition activated. My guess is that your tach's wire is connected to the extractor fan instead of the ignition switch.

Here's your picture.
This thread has more than 10 replies. Click here to review the whole thread.

 
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


All times are GMT -4. The time now is 09:21 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.