Cub cadet LT1045 will blow the 20 AMP fuse when cutting grass. This is the only time it will blow. I have disconnected the PTO and the mower runs and drives with no issue. I have also replaced the fuse and let the mower run for 10-15 min with the PTO engaged and running while not cutting grass. When I mow, I can get a few rounds of my yard, then the fuse blows. I have check the wires to the PTO and there is no chafing and did not read as shorted on a meter. I have visually checked the other wires and show no signs of wear, cuts or chafing. I did recently have a bad battery. I used a lith-ion battery pack to jump it a couple of times, then replaced the battery.
SOURCE: A short in the pto wiring perhaps?
Form what you are desribing you have a direct short, probaly in the wiring going to pto. I t has rubbed somewhere and is causing your short. Unplug the wires at connector close to your pto clutch and try it again and see if fuse stuill blows after you unhook it.
If the fuse still blows it is in the wiring going back up to thje switch. If the fuse does not blow after unhooking wiring connector the problem is in the clutch.
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SOURCE: Blown fuses when mowing
you have a wire that is shorting out somewhere, i would trace the wires from the clutch all the way back to the fuse including the relay and pto switch. You will more than likely find your problem in the control circuit between the fuse, pto switch and relay since this is what is fuse protected.
SOURCE: Cub Cadet 1861 amp light comes on when the PTO is
Sounds like you have a short circuit, either in the PTO clutch, or in the wiring that goes to it. Inspect the wiring for any obvious spots where insulation has rubbed off or burned. Also look at the wiring at the back of the PTO engagement switch for these signs. Before buying an expensive PTO clutch, unplug its connector. Drive around with the PTO switch on (even though the PTO won't activate and the blades won't be engaged). If the fuse doesn't blow, the problem must be within the PTO clutch. If the fuse still blows, it must be in the PTO switch or the wiring from there to the clutch. Use an ohmmeter to trace and find the short. Good luck!
SOURCE: CUB CADET MOWER KEEPS BLOWING
Hi and welcome to FixYa, I am Kelly
The service manual is here:
http://manuals.mtdproducts.com/mtd/GetFile.do?filename=769-02100.pdf
The wiring diagram is on page 84 of the manual.
Disconnect the positive and negative terminals from the battery and make sure they do not contact the chassis to form a ground. Read for a short with the key in run and lights OFF from the positive battery terminal to chassis ground. If you ar noting a short at this time you are literally going to have to chase wires. I would start by disconnecting the red wire from the PTO switch followed bythe red wire on the PTO relay. If the short goes away I suspect a problem with the wires at the PTO clutch as this is were many wiring problem manifest due to foreign objects thrown by the belt hit the wires on the clutch. After that I disconnect the engine connector and check again. Lastly I would disconnect the dash monitor connector and test again. If you still have the problem after disconnecting the engine harness and dash monitor there is a wire chaffing some where against the chassis. You can find it... it just takes a lot of time.
On another note...
You should probably make sure the ignition switch is not causing your problem.
Key switch testing connector removed
Off = M+G+A1 (continuity) Also read each one to the case of the switch
Run W/lights = B+A1+A2 and L (continuity) Read B + A2 to to the case of the switch.
RUN = B+A1 (continuity)
Start = B+S+A1 Read S to the case of the switch. (continuity)
Don't forget to remove the large (+) wire off of the start solenoid when troubleshooting or you will read the starter winding giving you a false ground.
Troubleshooting will end up being isloation of one leg of each wire at a time. I usually make a straight line sketch of wire temination points by wire color and connection on scratch paper for each wire I test and draw a single angle line across it after I have tested it.
If you determine that the problem is in the engine alternator, I will need your engine model number so I can get the service manual for that also.
A word to the wise.... if you disconnect a wire... write down color and where it was disconnected from on scratch paper. and line it out after you re-connect it. (experience)
Thanks for choosing FixYa,
Kelly
the cover missing will not causing the fuse to blow a grounded out wire will
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