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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Load Test

NOTE: All accessories must be off and battery fully charged prior to performing this procedure.

1. Connect voltmeter between alternator (B) terminal and battery ground terminal.
2. Connect ammeter between alternator (B) terminal and battery (+) terminal.
3. Run engine from idle up to 2000 RPM, then turn headlights and blower motor On.
4. Read ammeter. If reading is lower than 20 amps, alternator must be repaired or replaced.