Need electrical help Jacobsen
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Forum Name: Shops, Barns, Varmints, and Trucks
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=206944
Printed Date: 05 Jun 2025 at 4:26am
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Topic: Need electrical help Jacobsen
Posted By: Tracy Martin TN
Subject: Need electrical help Jacobsen
Date Posted: 01 Jun 2025 at 7:16pm
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I have battled this for years. Today it has stopped running. I have a Jacobsen 445G turfcat mower. Front deck 72 inch cut. Since I acquired it, at times it would start with the key, others it would not. It would start by jumping at starter fine, but you got to lay on the ground to do it. It has several safety switches, seat, PTO, Parking brake, and tranny lockout. Recently it would die when you put tranny in gear, or turned on PTO. Today it died from the parking brake being released. It has a start circuit and run circuit for the switches and interlocks. I was wondering if one of you electrical gurus would look at the wiring schematic and see what is most likely cause. I put a new key switch on it, and the brake pedal switch today. Still nothing. I think it might be the tranny switch, but not smart enough to be able to tell. It started after several attempts today after i wiggled the brake switch. After it warmed up, i moved pedal and it died instantly, this was with old limit switch on pedal. Any help appreciated . I have a copy of schematic but can't post it. I can text a copy if you want to help. Thanks a million! Tracy ------------- No greater gift than healthy grandkids! |
Replies:
Posted By: Tracy Martin TN
Date Posted: 02 Jun 2025 at 9:47pm
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Update on Jacobsen, I am much closer to solving the problem. Found a safety switch that was causing my no key start with starter. I jumped it out and it will start with starter and run. The bad, as soon as I take off parking brake it will die. As soon as you turn on PTO it will die. I did notice with seat safety switch jumped out or unplugged makes no difference. Something from the start circuit and run circuit is the cause, but can't figure it out. Any help appreciated. Thanks, Tracy ------------- No greater gift than healthy grandkids! |
Posted By: steve(ill)
Date Posted: 03 Jun 2025 at 9:17am
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lot of times, if the pto or brake is killing the motor, it is because the seat switch is bad or not stroking far enought when you set on it.. switch is also makde so you can NOT bypass it and will NOT work if disconnected.... there is a terminal switch built into the PLUG... you might hold the switch in yoru hand and work it. push HARD and see if that makes it work... thyt are hard to test.... you can test the switch by itself for on - off contact. ------------- Like them all, but love the "B"s. |
Posted By: steve(ill)
Date Posted: 03 Jun 2025 at 9:22am
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take the switch and a battery and light and connect all in series.. see if the switch wiill turn on the light or if randomly works ------------- Like them all, but love the "B"s. |
Posted By: Tracy Martin TN
Date Posted: 03 Jun 2025 at 8:57pm
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Steve, I will give it a try! Thanks, Tracy ------------- No greater gift than healthy grandkids! |
Posted By: Dave H
Date Posted: 04 Jun 2025 at 10:38am
My toro was acting goofey in that turning on the pto would intermittenly kill the motor. As you know there ar a few wires that go to that critter. Batting around in the dark, I threw a new pto switch at it and it is now running like a champ. I donno 
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