How I fixed my Stewart-Warner Tach - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Electrical
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 08-06-2010, 03:00 PM
Registered User
 
Last photo:
Join Date: Aug 2008
Location: Nova Scotia, Canada
Posts: 337
Wiki Edits: 0

Thanks: 0
Thanked 2 Times in 2 Posts
How I fixed my Stewart-Warner Tach

After a few years of having the tach operate intermittently, hang up at a random rpm , read too high, read too low, etc., I decided to have a look at it. It doesn't come apart as the trim bezel is swaged over the outer case, so it would be ruined if I attempted to open it up. I figured I'd have to buy a new one, but I did a few other things first and it works great now. Here's what I did:

1/ Fix the ground. The ground wire to the tach was between the nut and the mounting bracket on the stud marked GND. I scammed a pic off the net so you can see, even though I think it is a speedometer shown. There was no support behind the bracket, so I added another nut. Once everything was back installed, I tightened the extra nut up against the back of the bracket firmly sandwiching the ground connection. I know this at least helped my panel lighting which is now as bright as the other instruments. It was slightly dimmer before.



2/ There is a 4-6-8 cylinder switch on the back of the tach. Thinking it might have dirty internal contacts, I rotated the switch CW and then CCW several times. The switch doesn't have much in the way of detents, so once back in the car, I fired up the engine and adjusted the switch to the middle of the range it worked in. I suspect this is what helped the most.

3/ Contacts on the SIG and BATT lugs were male spade terminals, so I cleaned them with a bit of 800 grit paper. They looked more or less OK to begin with, so I doubt this did much.

So I'm sorry I can't narrow it down more, but if you have a wonky tach, and you know your ignition system is working properly, try these three things and maybe save yourself the cost of a new tach.....at least for a while.

    Advertisement
Reply With Quote Quick reply to this message

Recent Electrical posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
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 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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Stewart Warner Fuel Pump rebuild kit Dbodily Engine 1 06-25-2009 06:48 PM
help with stewart warner wings series 3 3/8 tachometer atichargr Electrical 1 01-02-2009 08:47 PM
Unknown Stewart Warner Tach - Please Help ID dukes69 General Rodding Tech 9 12-01-2008 07:30 PM
mustang tach wiring stang_steve Electrical 0 07-14-2004 07:28 PM
stewart warner gauge buds53 Hotrodders' Lounge 1 05-12-2002 05:46 PM


All times are GMT -6. The time now is 01:54 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.