2004 Official factory service manual for Yamaha YFZ450S ATV Quad., Page 19Get this manual
IMPORTANT INFORMATION EBS00019
GEN INFO
CHECKING THE CONNECTIONS Check the leads, couplers, and connectors for stains, rust, moisture, etc1Disconnect: lead coupler connector 2Check: lead coupler connector Moisture Dry with an air blowerRuststains Connect and disconnect several times3Check: all connections Loose connection Connect properlyNOTE: If the pin on the terminal is flattened, bend it up4