Skwerl58 767 #1 Posted October 9 Last year I got a 1995 Ford GT85 garden tractor with 780 hours that has a 18hp Kohler Magnum and it runs great. I really like this tractor because it is hydrostat, power steering, hydro lift, 48 inch deck and it has the pedal control. The problem is I had to jump it off and crossed the cables and since this incident the battery light is on. Battery is new and stator is putting out 42v and I checked voltage at the battery and it is 12.54v not running and 12.43 while running. Does this point to a bad regulator/rectifier? A new Ford NH rectifier is $291 and an Amazon one is $47 so I want to make sure it needs it before I order one. This Ford is a Shibaura, Japanese made tractor and is a good piece of equipment. Any suggestion and help is appreciated! Share this post Link to post Share on other sites
953 nut 62,251 #2 Posted October 10 13 hours ago, Skwerl58 said: I had to jump it off and crossed the cables and since this incident the battery light is on. There are three terminals on your voltage regulator. You have already verified the AC terminals are receiving adequate voltage from the stator, how about the B+ terminal? It needs a twelve volt source to work, could be a fuse blew when you crossed the cables. 1 Share this post Link to post Share on other sites
Skwerl58 767 #3 Posted October 10 Thanks for the response. The regulator on this tractor has 6 wires and I have a schematic but some of it is just confusing. I have checked the fuses and now will locate the regulator and check the wires leading to the battery and other wires for voltage. I have attached the schematic: GT85 Electrical Schematic (5).pdf Share this post Link to post Share on other sites
Handy Don 14,714 #4 Posted October 10 (edited) I can understand liking a unit with the features you have. The schematic is confusing, for sure. Me? I’d start by making sure all the connectors (and there are a LOT of them) are all clean and making good contact. I’d look particularly at the wiring from the R regulator terminal through to the solenoid (#7) via the fusible link (#15) for connectivity. If still a no-go, I’d make some schematics that are like those in the Demystify document for WHs that cover only the parts of the circuit for engine start, engine run, and charge. Two of the terminals on that regulator are for indicator lamps and interlocks. I’d also search for the regulator’s manual so I understood ALL the terminals’ usage. Edited October 10 by Handy Don Share this post Link to post Share on other sites
953 nut 62,251 #5 Posted October 10 On 10/9/2025 at 5:09 PM, Skwerl58 said: has a 18hp Kohler Magnum Too bad they didn't use the Kohler voltage regulator like Wheel Horse did. The Diode ( #15 ) might have taken a hit when the polarity was reversed. Do the hour meter and fuel gauge work? 6 hours ago, Handy Don said: If still a no-go, I’d make some schematics that are like those in the Demystify document for WHs that cover only the parts of the circuit for engine start, engine run, and charge. Two of the terminals on that regulator are for indicator lamps and interlocks. I’d also search for the regulator’s manual so I understood ALL the terminals’ usage. Hope more information than the one drawing is available. Share this post Link to post Share on other sites
