John Deere keeps blowing starting fuse.

[Rolandfelder]

My 5045D tractor keeps blowing the ignition fuse. I disconnected the water pump sensor and replaced the fuse. But it does it again

 

[thepumpguysc]

Look under the inj pump for 2 wires.. follow them up to a connector that u can disconnect.. Disconnect it..
The actual problem is the temp sensor that screws into the thermostat neck.. it’s bad..
If u live in temperate climate just unplug it.. if u live where it gets cold and u use the machine in the winter, replace the sensor..

 

[Rolandfelder]

I’ve done that a few days ago and it ran good but yesterday it started blowing them again. I’m baffled

 

[jaxs]

You will be much better off learning to troubleshoot rather than attempting to find someone who experienced same problem with same solution when there's a problem. If you are interested,have determination,time and a multi-meter,tell us whether or not you are familar with using a multi-meter and we can get underway.

 

[MinnesotaEric]

Look under the inj pump for 2 wires.. follow them up to a connector that u can disconnect.. Disconnect it..
The actual problem is the temp sensor that screws into the thermostat neck.. it’s bad..
If u live in temperate climate just unplug it.. if u live where it gets cold and u use the machine in the winter, replace the sensor..

I'm drawing this out for the benefit of the OP. Without the benefit of a wiring diagram, the T-Stat sensor must be supplying some type of floating ground for the fused power that is on the same circuit as a starter replay. Disconnected, the fused power must find a different ground somewhere else. That correct?

Question: is the ignition's fused power on the control side of a relay or solenoid or is it is fused power on the working side?

 

[beenthere]

In place of the blown fuse, insert a 12v lightbulb.. soldered to an old fuse.

That way, the short only lights up the bulb and allows you to track (or attempt to) down the short.

 

[Rolandfelder]

You will be much better off learning to troubleshoot rather than attempting to find someone who experienced same problem with same solution when there's a problem. If you are interested,have determination,time and a multi-meter,tell us whether or not you are familar with using a multi-meter and we can get underway.

Yes sir I’m familiar with a multi-meter

 

[jaxs]

Yes sir I’m familiar with a multi-meter

That give's you a huge headstart on the majority. Inspect fuses to make certain one hasn't been bypassed with foil or such nor has a larger than speced fuse in place. With exception of glow plug circuit,pull all fuses. Set meter to amps connected in series on wire feeding the problem fuse. Starting tractor shouldn't be neccessary. Observe glow plug draw and compare to spec. If unreasonablly higher amp draw,disconnect plugs one at a time to see if a single plug is pulling excess amps. Make certain glow plug relay turn's them off within prescribed time. If all is well with glow plug circuit,amps should be 0 or only mA after relay turn's plugs off and we will pick it up from here to check other circuits.

 

[Rolandfelder]

That give's you a huge headstart on the majority. Inspect fuses to make certain one hasn't been bypassed with foil or such nor has a larger than speced fuse in place. With exception of glow plug circuit,pull all fuses. Set meter to amps connected in series on wire feeding the problem fuse. Starting tractor shouldn't be neccessary. Observe glow plug draw and compare to spec. If unreasonablly higher amp draw,disconnect plugs one at a time to see if a single plug is pulling excess amps. Make certain glow plug relay turn's them off within prescribed time. If all is well with glow plug circuit,amps should be 0 or only mA after relay turn's plugs off and we will pick it up from here to check other circuits.

I can’t find out which one is the glow plug circuit

 

[Rolandfelder]

I can’t find out which one is the glow plug circuit

There is a relay under the fusible link I can’t find out what it is for.