Farm Equipment - 7580 gages

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7580 gages

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=210600
Printed Date: 02 Apr 2026 at 12:08am
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: 7580 gages

Posted By: TrentH
Subject: 7580 gages
Date Posted: 01 Apr 2026 at 4:38pm

I have a 7580 that the temp and fuel gauge are all over the place when the tractor is running and when you turn the lights on the tac bogs down I’ve cleaned the main ground cable and no difference in how they act, the other odd thing is that after I cleaned the ground cable the self test of the warning lights worked for 5 seconds and quit but it still will start with the button. Any help is greatly appreciated.

Replies:

Posted By: DrAllis
Date Posted: 01 Apr 2026 at 6:10pm

Start by unplugging the two harness connections straight ahead of the brake pedals, in the engine bay. Spray WD40 all over the prongs and re-connect them back together fully. Inspect for rust/corrosion or any wiring issues in that area.

Posted By: TrentH
Date Posted: 01 Apr 2026 at 6:43pm

Alright I’ll have to pull those when I split it to do the power director anyway so hopefully that’s the problem.

Posted By: DrAllis
Date Posted: 01 Apr 2026 at 6:59pm

Sometimes when I have those connections separated, I will take a needle nose pliers and twist each male spade just a bit so they fit tight when you re-couple them.