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

Voltage Regulator


Measure battery voltage and record figure. With engine operating off idle and all secondary electrical systems turned off, regulated voltage should be no greater than 2.5 volts above recorded figure. Turn on headlights and set heater blower to high. Regulated voltage of idle should be no less than 0.5 volts above recorded figure.