A1 Cardone 40-10022 Wiper Motor WIPER MOTOR 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.