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

Test Light

Test Light

The test light, as shown in figure, uses a 12 V bulb. The two lead wires should be connected to probes. The test light is used for simple voltage checks and in checking for short circuits.






CAUTION: When checking the engine control module (ECM), never use a bulb exceeding 3.4 W.