John Deere 5105 no electrical power

[coyote77]

I checked the ground from the battery to the engine block an seemed to have a very good ground. I thought the same thing too. but as far as I can tell there is a good ground. Gee's I hope I don't have to put my tractor down. LOL

 

[JD5210]

You might consider getting a wiring diagram, check out selectmanuals.com, $29.95 for tech. manual. You may have a grounding problem, in that some + positive wire is grounding out.

You might consider this approach. Make sure the battery has 12.5 volts, (if there is something grounding out, it is taking the battery with it) pull all of the fuses not needed for starting the tractor, to me that would be f1,3,4,5,7 thru 15. I would think you only need f2 and f6. If f2 is the fuse that blow, disconnect the cold start advance. Post back is you do not know what this is. I know is this going to make it harder to start. See, if it will start or at least turn over the starter. If the starter turns over, stop put the key in the RUN position and push it in for a count of ten, then try starting it again. If it starts, but runs rough (while running) push the key in again, until it runs smooth.

Which fuse did you blow, as I do not see a 25 amp fuse?

URL to operators manual.
http://manuals.deere.com/omview/OMRE72817_19/?tM=FR

The following is from the operators manual
F1-10 amp-Alternator, Instruments and Engine-Related Warning Indicators
F2-20 amp-Fuel Shut-Off Solenoid
F3-20 amp-Warning Lights and Indicator
F4-20 amp-Flood Light(s)-If Equipped
F5-20 amp-Auxiliary Circuit ("Hot" all the time)
F6-30 amp-Key Switch, Starting Circuit, PTO Warning Circuit, Seat Switch, PTO Switch
F7-30 amp-Horn, Lights, Turn Signals
F8-30 amp-Seven Pin Connector
F9-20 amp-Tail Light(s)
F10-20 amp-High-Beam Headlights and Indicator
F11-20 amp-Low-Beam Headlights
F12-30 amp-Auxiliary Circuit (Key Activated)
F13-Not Used
F14-Not Used
F15-Not Used
F16-Not Used

 

[coyote77]

Took out the fuse's except for f2 an f6, turned the key on and tried to start. The starter made one loud bumb and then back to nothing again. A real puzzele to me. Now I am at a real loss.

 

[coyote77]

After some more checking of the sys. I found the starter relay was not holding through the cycle of starting and at first I had all electric,when I turned the key to start the relay made a half click and everything went out again. Thanks everyone for all your input. I'll let ya know if this was the problem and I'm pretty sure at this point this is the fault point.

 

[JD5210]

If after replacing the starter relay, you are still having a problem you may want to read this thread #6 and #8 of this post.

http://www.tractorbynet.com/forums/...ating/277794-deere-5410-starter-10-tooth.html

 

[jd110]

This problem sounds like a bad battery cable to me. Have you checked for 12 volts at the large post on the starter? Connect positive voltmeter lead to the large starter post and negative lead to a clean ground on the frame. turn on the key and then try to start. Voltage might dip a little but should not go below around 10 volts at lowest. If it drops to zero or close to it, then you have a bad cable or connection. Do either of the battery cables have repair ends on them? That is a common source of problem with corrosion getting into that connection.