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

Wiper Relay: Testing and Inspection


Fig. 5 Intermittent relay test:






1. Disconnect electrical connector from wiper/washer switch.
2. Position wiper switch to INT.
3. Connect battery positive to YEL/WHT connector terminal and battery negative to BLK connector terminal, Fig. 5. Relay is good if operational sound of relay can be heard.