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)

Or, hide this message: temporarily or permanently

Battery: Testing and Inspection


Voltage Inspection

CAUTION: When disconnecting the battery, remove the negative cable first and install it last to prevent damage to electrical components or the battery.




1. Disconnect the battery cables from the battery.
2. Connect a voltmeter to the battery.

Battery Discharge Test




Battery voltage with load




Test load




Battery Voltage with Load

Terminal and Cable Inspection

1. Clean and tighten the battery terminals and cables.
2. Coat the terminals with grease.
3. Inspect for corroded or frayed battery cables.
4. Check the rubber protector on the positive terminal for proper coverage.