Yesterday's Tractor Co. Shop Now
   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver
Classified Ads
Photo Ads
Tractor Parts

Discussion Forums
Project Journals
Tractor Town
Your Stories
Show & Pull Guide
Events Calendar
Hauling Schedule

Tractor Photos
Implement Photos
Vintage Photos
Help Identify
Parts & Pieces
Stuck & Troubled
Vintage Ads
Community Album
Photo Ad Archives

Research & Info
Tractor Registry
Tip of the Day
Safety Cartoons
Tractor Values
Serial Numbers
Tune-Up Guide
Paint Codes
List Prices
Production Nbrs
Tune-Up Specs
Torque Values
3-Point Specs

Tractor Games
Just For Kids
Virtual Show
Museum Guide
Memorial Page
Feedback Form

Yesterday's Tractors Facebook Page

Related Sites
Tractor Shed
Ford 8N/9N Club
Today's Tractors
Garden Tractors
Classic Trucks
Kountry Life
Restoration & Repair Tips Board

Re: 1086 IH Digital Tach will not work

[Show Entire Topic]  

Welcome Guest, Log in or Register
Author  [Modern View]
Jon Hagen

05-21-2012 22:00:18

Report to Moderator

Sounds like it is not getting power. Check the fuse and wiring to the tach. Possibly a bad cab power relay. Do the other gauges , cab blower and such work ?? They are all powered by the cab relay.

Their is a good wiring diagram in the operators manual.

[Log in to Reply]   [No Email]
D Rush

05-22-2012 11:28:48

Report to Moderator
 Re: 1086 IH Digital Tach will not work in reply to Jon Hagen, 05-21-2012 22:00:18  
all the other gauges work, cab blower works, no blown fuses.

[Log in to Reply]  [No Email]
Jon Hagen

05-22-2012 13:01:14

Report to Moderator
 Re: 1086 IH Digital Tach will not work in reply to D Rush, 05-22-2012 11:28:48  
Use a voltmeter or test light to see if you have 12V in the plug that connects to the dig tach.

Your wiring diagram may have the position and color code for the supply and ground wires.

If the repair shop says the dig tach is ok, then it is a pretty good chance that it lacks power or ground on your tractor.
A DVOM can test the plug for both 12V supply and ground.

[Log in to Reply]  [No Email]
D Rush

05-22-2012 19:18:05

Report to Moderator
 Re: 1086 IH Digital Tach will not work in reply to Jon Hagen, 05-22-2012 13:01:14  
I put a new oil pressure switch on this evening and tach is working fine.

Thank you very much for all the info.

[Log in to Reply]  [No Email]

05-26-2012 04:50:14

Report to Moderator
 Re: 1086 IH Digital Tach will not work in reply to D Rush, 05-22-2012 19:18:05  
I was about to mention the pressure switch but you found it. If you want to, you can put a jumper in the plug that plugs into the pressure switch to bypass the switch. Then search around and find where the power wire gets it's power and move it to a switched location instead of steady hot. That way the tach comes on whenever you turn on the ignition switch. It's been so long ago that I did that to my 1086 I've forgotten which wire it is but it's not too hard to do. If I remember right, you do it by the fuse panel. Jim

[Log in to Reply]  [No Email]
Jon Hagen

05-26-2012 19:25:42

Report to Moderator
 Re: 1086 IH Digital Tach will not work in reply to Fixerupper, 05-26-2012 04:50:14  
Thanks guys, I did not realize that the tach was powered from an oil pressure switch on a 1066.
Anyone know why that was done instead of powering it from the ignition switch ??

I ran into that on later 14 series IH combines where the electro hydraulic valves were powered from an engine oil pressure switch so the reel or header drop hydraulic functions would not work if the engine was not running.

[Log in to Reply]  [No Email]
[Show Entire Topic]     [Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:

Fast Shipping!  Most of our stocked parts ship within 24 hours (M-Th). Expedited shipping available, just call! Most prices for parts and manuals are below our competitors. Compare our super low shipping rates! We have the parts you need to repair your tractor. We are a company you can trust and have generous return policies. Shop Online Today or call our friendly sales staff toll free (800) 853-2651. [ About Us ]

Home  |  Forums

Copyright © 1997-2018 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters