12v is applied to the instrument panel module and the sensors (light bulb in this case) is/are looking for a ground. The switch (oil pressure sending unit) should be short circuited, illuminating the oil press light until oil pressure is up to around 8# or so where the switch opens and shuts off the light.
If you pulled the wire off the sending unit and the light is still on, you have a short in the wiring harness or on the rear of the instrument module.
Pop the module and remove the oil pressure input wire. If the light goes out with the key on, the short is in the wire between the sending unit and the inst panel.....rats ate the insulation off the wire, or age did it's thing and the insulation cracked and fell off.
Otherwise the problem is in the instrument panel...circuit card may have gotten wet, or contaminated with dirt and all and shorted out.
I bought 2 recently off ebay, brand new for $80 ea., free shipping, one gen. driven and the other alt. driven, tach zero on opposite sides. Solves a lot of problems and looks great too. I don't know what they sell for at YT. Maybe I should have looked there first. I do a lot of ebay shopping. Just went there out of habit.
Upload one or more videos to your post. Photo filesizes should be less than 300K and Videos, less than 2MB. Formats allowed are gif, jpg, png, ogg, mp4, mov, and avi. Be sure to use filenames without spaces or special characters, and filetypes of 3 digits lower case.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
... [Read Article]
Latest Ad:
1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
[More Ads]
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.
