Farm Equipment - 200 Temp Gauge

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200 Temp Gauge

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=173260
Printed Date: 12 Sep 2025 at 2:29pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com

Topic: 200 Temp Gauge

Posted By: Red Bank
Subject: 200 Temp Gauge
Date Posted: 01 Aug 2020 at 9:27pm

I bought a new coolant gauge and sending unit for the 200. Not really sure how to wire it up. Old gauge had two terminals + and -. New one has three terminals one marked 12v and the other ones negative. When I hook up the hot wire from the fuse to the gauge at the 12v post something pops in the switch and I lose power to the fuse. Not sure what’s going on but the main question is how to hook up the new gauge.

Replies:

Posted By: Joe(TX)
Date Posted: 02 Aug 2020 at 7:40pm

12 volt from the switch ign. terminal. The minus to the sending unit. Should only have power with switch on.

If it pops at the switch there is a short somewhere.

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1970 190XT, 1973 200, 1962 D-19 Diesel, 1979 7010, 1957 WD45, 1950 WD, 1961 D17, Speed Patrol, D14, All crop 66 big bin, 180 diesel, 1970 170 diesel, FP80 forklift. Gleaner A

Posted By: DrAllis
Date Posted: 02 Aug 2020 at 8:19pm

The third connection is to go to a ground. It is DIFFERENT than the original design.