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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Solenoid Terminal Voltage Drop Test


1. Connect voltmeter across two main solenoid terminals and crank engine.
2. A zero or fractional reading indicates high resistance in starter circuit is result of high resistance battery cables or soldered connections.
3. A high reading indicates a faulty solenoid or connections.