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

Ignition Coil

Coil Polarity:






IGNITION COIL RESISTANCE @ 21°C-27°C (70°F-80°F)

Coil Manufacture Primary Resistance Secondary Resistance
Weastec 0.45 TO 0.65 Ohms 7,000 to 15,800 Ohms
(Aluminum Towers)

Diamond Electric 0.45 TO 0.65 Ohms 7,000 to 15,800 Ohms
(Brass Towers)