Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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A/C Diode Test

A/C Diode Test

NOTE: The diodes are designed to pass current in one direction while blocking if in the opposite direction. Most ohmmeters, unless equipped with a diode tester, should not be used to test diodes.





Check for continuity in both directions between the A and B terminals. There should be continuity in only one direction.