Cardone 40-387 Remanufactured Domestic Wiper Motor Each unit is 100% computer tested at 3 points in the manufacturing process to gaurantee performance every time. Every motor is assembled with the precise amount of lubricant which ensures quiet operation and long life. Motor magnets are 100% recharged for OE performance and reliability. Make sure the connector weather seal is in place and in good condition, if so equipped. Replace if necessary. Make sure harness is well insulated and routed as designed. Make sure motor is well grounded. Make sure motor is mounted as designed. Check all drain paths  clean and clear of any debris. When re-installing cowl shield, ensure that there is a weather tight seal between cowl and windshield glass.  An improper seal or gap will cause premature failure due to water damage.