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How Do I Test a Tractor Diode?

We want to help you test a tractor diode.

If you do not feel that you understand these steps, or can perform them safely, consult your tractor dealer or local mechanic. Also always consult your tractor owner’s manual for model-specific information.

To complete this task you will need to purchase a diode tester.

Time to get started.


1. Remove the diode from the connector.

2. Connect the ohmmeter red(+) lead to pin (A, Fig. 1) of the diode.

3. Connect the ohmmeter black lead(-) to pin (B, Fig. 1) of the diode.

4. Check for continuity.

5. Reverse the test leads.

6. Check again for continuity.

Results Interpretation/Remedy

  • Replace the diode if there is no continuity, in both test positions.

  • Replace the diode if there is continuity in both test positions.

NOTE: There should be continuity in only one position.

If you need any further help or have any questions about diodes, tractors, or anything else, please contact your dealer, local mechanic, or call us at 602-734-9944. Please ask about our current new and used tractor supply.

Team Tractor and Equipment - #1 Tractor Dealer in Arizona. We sell and service most major brands of tractors including Yanmar, Kubota, John Deere, TYM, Mahindra, Kioti, Case, New Holland, Massey Ferguson, Ford, Deutz, Case IH, Farmall, International Harvester, Branson Tractors, LS, Shibura, Claas Tractor, McCormick Tractors, Valtra, Solis, YTO, Montana, and Nortrac.

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