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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Overdrive Switch: Testing and Inspection

1. Remove the column covers.
2. Turn the ignition switch to ON.





3. Check the voltage between terminal C and a ground.





4. If not correct, check continuity between terminals A and C of the O/D OFF switch.
5. If not correct, replace the change knob as an assembly.