Ford KA rear wiper - intermiitent operaton

For those of you who have a Ford KA you might have wondered why it is that you rear wiper sometimes works and sometimes doesnt. The real proplem is that there is no earth cable from the rear tailgate
through to the main body with the only contact coming through the hinge of the tailgate. I have found that consistent operation can be restored by greasing the tailgate hinges with "coppergrease"...a grease which is loaded with copper which is normally used as an anti seize compound but which also increases conductivity through the hinge. Another annoying little fault with the KA sorted!
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