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

Circuit Testing

I/P dimmer switch
1. Remove the switch.
2. Apply 12 V to terminal 3 and ground to terminal 2.

Circuit Testing-I/P Dimmer Switch:




3. Check that the DC voltage at terminal 4 changes as indicated when rotating the potentiometer.
4. If not as specified, replace I/P dimmer switch.