Not the hinge, the door latch mechanism on the rear of the door. There
is a small hole you can spray into with a long nozzle. I had the same
problem on my 95 Ranger. It's also better to use an electrical contact
cleaner, WD-40 can attract/hold dirt. So far mine has continued working
for 2 years although I hear some people have to replace the switch to
fix the problem.
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