Can you post a picture and description of the switch and mounting that you used? This has been on my "list" of indoor projects to do for a year.
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Recommend using a magnetic reed switch commonly found used in security systems as any type of non sealed mechanical switch is likely to get jammed up with dust and dirt on the underside of a tractor. The levers and rods underneath the typical tractor also don't lend them selves very well in providing convenient and protected locations for the switch.
The first and last photos below show how I mounted the switch on my BX2230, the first pic with the brakes off and the last one with the brakes on. Another issue to consider is as the brakes wear, the brake pedal/lever is going to move further and further down over time, so I chose a switch that can be set up to be in the off position when the brake pedal is at the top of it's travel, and activates as soon as the pedal moves off the home position.
To do this with a magnetic switch, you need a switch that provides (C) common and (NC) Normally Closed contacts, and will likely have the (NO) Normally Open contact which is not used with the way mine is mounted. When the magnet is next to the switch, the magnet opens the (NC) normally closed contacts and as the brake pedal is pressed, the NC contacts go closed as the magnet moves away from the switch.
Since wiring is going to vary tractor from tractor, you'll probably need to do a bit of voltmeter probing to find the correct place to wire the switch into. On my BX2230, the Hazard Warning Light switch is a simple single pole, single throw switch with only two connection points, so the magnetic switch is simply wired in parallel with that switch. Since the flashing yellow lights are on the rear of the tractor and the instrument panel flashing lights are too dim (or is it me :<)) for me to see in bright sunlight, I added an additional amber LED light up front.
Lastly stay away from the cheapest priced magnetic reed switches. I've had a few of them in the house security system start sticking.
While I was concerned a bit with the small current ratings magnetic reed switches tend to have, this one has worked well on the tractor.
https://smile.amazon.com/Philmore-N...coding=UTF8&psc=1&refRID=MP799J66F9KGJ5R0EZ5Z