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Chuck14025

520H Won't Start - Electrical Problem

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Chuck14025

Suggestions welcome........

 

1. 1994 520H won't start.

2. Tractor MOD 73501.

3. Serial # 4900293.

4. Lt Blue wire at starter solenoid not getting juice.

      If solenoid is energized, starter turns engine right over. 

5. Fuses ok on both sides. 

6. Neutral, seat, and PTO switches test ok but have voltage drop.

7. Key switch test ok.

8. Replaced 9 pin connector with soldered fittings.

9. Battery ok. 12.6 volts. 

10. The three relays seem to be inaccessible under the battery box. Not able to check them. Anyone have any suggestions for getting access to them without taking the tractor apart?

11. Instant voltage drop at safety switches and on voltmeter when key is turned to start.

            Yellow wire on PTO switch registers 11.3 volts.

            Lt Blue wire on Neutral Switch registers 10.7 volts. 

12. Very faint click in the center of the tractor when the start switch is energized. 

13. If there is a park brake switch, where is it located? 

 

Since I have only moderate electrical experience I could be missing something very basic. Suggestions welcome and thanks for reading.

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lynnmor

The easiest way to get to the relays is by removing the belt guard on the right side.  Since you are seeing a voltage drop, I think you might have a corroded connection.  The connectors for the relays can corrode since they are not the weatherproof type that should have been used.  Consider replacing the relays and connectors with weatherproof components or at least clean them as best you can, yes it would be a miserable job.  I bought connectors that use the original wires so no wire splicing is necessary and when I find a lot of time will convert to weatherproof.

 

Did you download this guide?

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Chuck14025
Posted (edited)

Lynnmor,

Thanks for the quick response. 

Yes, I have the Demystification Guide. Very helpful.

I'll try to get at the relays by removing the oil filter and if needed come at them from the belt side. Most likely will be needed. One could almost take the engine off and out of the way at that point. 

And thanks for the directly information on the replacement relays and the Susquehanna supplier. I'll get them ordered. Don't want to do any job twice. 

How did you know the wiring would match the relays? 

 

Edited by Chuck14025

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lynnmor

There are numerous suppliers for this type of relay that is used in all kinds of applications.  Note that there are catches on the sides that are there if you want to add waterproof plugs.

 

That belt guard removal is a five minute job and well worth the small effort.

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Darb1964

I know this sounds elementary but did you check the ground wire?

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Chuck14025

Relative to the ground wire, I have 12.6 V on the frame. Relative to the elementary, in my experience, most problems turn out to be absolute basics. No questions are too elementary.

 

I'll tackle the belt guard removal to get at the relays. 

 

 

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