Farm Equipment - 7050 tach

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7050 tach

Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=20958
Printed Date: 11 Feb 2025 at 10:01pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: 7050 tach

Posted By: bakwoodsfarm
Subject: 7050 tach
Date Posted: 17 Nov 2010 at 5:57pm

Trying to figure out how to get the tach working on my 7050. Does it run off the alt, if so I have changed the alt to a chevy alt. The old one did have an extra wire hook-up on the rear but nothing was hooked to it. The tach hasn't worked since I have owned the tractor. I can't find anything in the shop manual on it.

Replies:

Posted By: Dans 7080
Date Posted: 17 Nov 2010 at 6:06pm

The tach does work off the alternator.

Posted By: bakwoodsfarm
Date Posted: 17 Nov 2010 at 6:18pm

The old alt was a delco and had 3 spade terminals and a stud terminal. The alt I put on it was a delco but it only had 2 spade terminals and a stud terminal. The shop manual does not show any wiring diagrams and the only delco alt it shows is the one that is on the tractor now. Does anyone have a wiring diagram for this tractor? And maybe know where I can buy a rebuild kit for my old alt.

Posted By: skipwelte
Date Posted: 18 Nov 2010 at 9:58am

the wiring diagram is in the operators manual. The correct alternator has two spades, one large stud and one small stud with no threads, the small stud with no threads is the tach pickup termainl, the tach counts the sine waves off one terminal on the rectifier bridge. There should be a small brown wire coming out of the harness with a terminal and black round insulator that pushes onto the small stud. HTH

Posted By: bakwoodsfarm
Date Posted: 23 Nov 2010 at 5:12pm

Does anyone know where to get a working tach for a 7050?

Posted By: Joe(TX)
Date Posted: 25 Nov 2010 at 10:27am

My Delco has a third spade terminal in front of the 2 standard spade terminals. Yhis like is shown in the service manual.

Posted By: DougG
Date Posted: 25 Nov 2010 at 10:45am

You may check AGCO , they had a new one for a 6060 AC for $205 new ; wasnt bad I thought , a 7050 is prolly the same tach ; Auto Value parts had a new alt. for $65 , had to swap pulleys worked great