Reply
 
Thread Tools Search this Thread Display Modes
 
Old 10-14-2017, 08:22 PM   #1
1 Rivet Member
 
1972 23' Safari
Flintridge , California
Join Date: Jul 2017
Posts: 5
How to make an original Ammeter work?

Hey dudes,
I have a '72 Safari and it is mostly intact. Sometime in its past, the Univolt was replaced and the original fuse board disappeared. As I understand it, there was a shunt of some sort connected to it to make the central control ammeter run which disappeared with the Univolt. Does anyone know of a way to return functionality to the ammeter without the original fuse board or have knowledge of how to make a shunt to replace it?
Thanks
-miker
__________________

Junk Man is offline   Reply With Quote
Old 10-15-2017, 02:37 AM   #2
Rivet Master
 
WayneG's Avatar
 
1984 27' Airstream 270
Scotia , New York
Join Date: Oct 2012
Posts: 1,082
In my 77 MH this is a page from the manual showing the fuse panel, shunt & stuff.
If nobody has the exact specs, and you are trying to preserve the original meter, you will need to see how many millivolts it takes to deflect the meter to a known amperage. From there you can find out what shunt to buy that matches that ratio.
Or there are a bunch of aftermarket methods.
https://www.amazon.com/Baomain-DH-67...mp+meter+shunt


Attached Thumbnails
Click image for larger version

Name:	Electrical-12VDC.jpg
Views:	49
Size:	256.2 KB
ID:	297034  
__________________

WayneG is offline   Reply With Quote
Old 10-15-2017, 10:32 PM   #3
1 Rivet Member
 
1972 23' Safari
Flintridge , California
Join Date: Jul 2017
Posts: 5
It looks like a copper strip with a slider for one of the legs. Is it really that simple? What would the gauge and dimensions of that strip be? Any ideas?
-miker
Junk Man is offline   Reply With Quote
Old 10-16-2017, 04:10 AM   #4
Rivet Master
 
WayneG's Avatar
 
1984 27' Airstream 270
Scotia , New York
Join Date: Oct 2012
Posts: 1,082
Quote:
Originally Posted by Junk Man View Post
It looks like a copper strip with a slider for one of the legs. Is it really that simple? What would the gauge and dimensions of that strip be? Any ideas?
-miker
It would not be copper because the resistance is too low. It would be a strip of resistive metal, thick enough to handle the total load current and long enough to generate millivolts between the 2 sense points. The shunt also needs to keep that resistance stable through a reasonable temperature range for meter accuracy.
This link may be a bit to technical, but it has the basic info.
https://meettechniek.info/instrument...resistors.html

If you are trying to make an exact replica, you are better off finding one in a bone yard. If it were me, I would find a commercial shunt that matches the meters needs.
WayneG is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

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
Ammeter connection bridor15 Batteries, Univolts, Converters & Inverters 8 02-13-2011 06:19 AM
Anyone out there with ammeter/shunt experience? johnobuttons Lights - Interior & Exterior 2 08-16-2009 11:40 PM
Ammeter Vs Ampmeter kennytheecat Electrical - Systems, Generators, Batteries & Solar 16 04-16-2009 12:56 PM
Ammeter need William8979 Electrical - Systems, Generators, Batteries & Solar 1 01-28-2007 07:32 PM
Ammeter smily Electrical - Systems, Generators, Batteries & Solar 14 08-12-2002 09:09 PM


Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by the Airstream, Inc. or any of its affiliates. Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.



All times are GMT -6. The time now is 01:00 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.