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

IGN11 - Check Spark Plug Wire Resistance



Spark Plug Wire Resistance Test:






^ Remove spark plug wire.

CAUTION: Do not under any circumstances puncture a spark plug wire when measuring resistance. Measure only as instructed.

^ Measure the resistance of each spark plug wire.

^ Is the resistance between 4,000-7,000 ohms per foot?

YES -- Go to IGN12. IGN12 - Check Voltage at Ignition Coil

NO -- Replace the spark plug wire(s).