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Replace the power door lock motors, cleaned and oiled all connections and the locks them self. Ground wire on pass door cleaned also. Drivers door works fine. any ideas why passenger door struggles to work . Im thinking power problem. Any ideas as how to check that.Its a 79 by the way.
Mechanical problem with the door lock mechanism? Is the passenger side harder to move by hand?
When you say oiled all connections do you mean you put oil on the electrical connectors? If this is the case the oil could be causing a bad connection as oil is a really good insulator & does not conduct electricity.
Ya what Don says - if the passenger motor is getting less voltage it could be a wiring issue. Trace back until you find a component that has good voltage going in but less coming out...