The location of the different circuits running through trailer plugs and connectors is pretty standard in manufacturing of the systems. When people install controllers and wire trailers the standard diagrams often don't get used and that can lead to trouble when swapping the trailer between vehicles. I find it hard to believe GM would stop all brake action if your vehicle didn't see the small battery. I know of similar GM vehicles pulling trailers with no breakaway set up and their brakes work. If the brakes don't work with out the trailer battery I still think you have a wiring issue. If the tow vehicle doesn't see feedback from the trailer brakes (wiring issue) or the controller's gain is set too low, the brakes may not work.
The 7 pin connector should have one pin that supplies power to the battery to keep it charged. There is a separate pin in the connector that powers the brakes when the brake pedal, or hand controller if you have one, is pushed. The ground terminal of the trailer battery should connect to the same point on the trailer the ground from the tow vehicle connects to. The positive lead of the trailer battery goes to one side of the breakaway switch. The other side of the breakaway switch is connected into the wire going to the trailer brakes. This is the same wire the tow vehicle sends power to the brakes through. Basically the two power sources (tow vehicle brake controller and small battery) are parallel so either can apply the brakes without the other. The small battery only supplies power to the brakes when the normally open breakaway switch is tripped so it is closed to complete that circuit.
Upload one or more videos to your post. Photo and video filesizes should be less than 8MB. 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 - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
... [Read Article]
Latest Ad:
Sell 1958 Hi-Altitude Massey Fergerson tractor, original condition. three point hitch pto engine, Runs well, photos available upon request
[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.
