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JD LX255 Electric PTO wiring issue

pto lx255

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#1 jd3810 OFFLINE  

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Posted April 14, 2016 - 10:34 AM

Worked fine last year but won’t engage this year.
although appeared OK, I replaced PTO switch.
although appeared OK, I replaced PTO with an old one for trial.
PTO (both units) has 3.0 ohms.
PTO (both units) will activate with direct 12V on blue wire from switch.
Ground tested OK at PTO connector.
With ign sw turned on, I have 18.5 Volts at the PTO connector.
(Is 18.5v Normal?)
With everything normal, PTO will not activate from switch
Without a wiring diagram, I am lost.



#2 larrybl OFFLINE  

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Posted April 14, 2016 - 12:51 PM

Worked fine last year but won’t engage this year.
although appeared OK, I replaced PTO switch.
although appeared OK, I replaced PTO with an old one for trial.
PTO (both units) has 3.0 ohms.
PTO (both units) will activate with direct 12V on blue wire from switch.
Ground tested OK at PTO connector.
With ign sw turned on, I have 18.5 Volts at the PTO connector.
(Is 18.5v Normal?)
With everything normal, PTO will not activate from switch
Without a wiring diagram, I am lost.

What is the battery voltage? I would suspect having 18.5V at the connector something is not right. The PTO sounds like it is fine, so something a-mis with the electrical. I think you are going to need a diagram for this.



#3 jd3810 OFFLINE  

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Posted April 14, 2016 - 03:58 PM

The battery voltage is 12.75.

It makes me wonder if the PTO has a safeguard for too much voltage.



#4 Auburn David OFFLINE  

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Posted April 14, 2016 - 04:07 PM

What is the battery voltage? I would suspect having 18.5V at the connector something is not right. The PTO sounds like it is fine, so something a-mis with the electrical. I think you are going to need a diagram for this.

I suspect he has lost ground or battery voltage and that is a phantom reading he is getting...one reason to own an old analog meter of a good test light.


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#5 jd3810 OFFLINE  

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Posted April 14, 2016 - 05:20 PM

You may have headed me in the right direction. My digital meter shows 18.5 v on the purple wires at the PTO switch connector when I turn on the ignition switch, but the OLD analog meter shows nothing. I've tested the PTO switch...purple and blue connect when the switch is pulled. I also made sure the analog meter read 12v across the battery...amazingly, it still works.

 

Any idea of the circuit paths of the 2 purple wires?



#6 jd3810 OFFLINE  

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Posted April 14, 2016 - 06:29 PM

I have continuity for the 2 purples onto the circuit board, but that's where my trail ends. Anyone able to help?







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