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

Main Ignition Coil

Ignition Coils:




Lucas twin coil ignition system:





1. Switch ignition on and check voltage at positive terminal of main coil C.
2. The main coil voltage should be 12 volts. If voltage is below 11 volts, check wiring from ignition switch G.
3. Disconnect lead from negative terminal of main coil and switch ignition on.
4. Negative terminal voltage should be 12 volts. If voltage is zero, replace main coil.