Drivers side wiper arm sloppy

[knever3]

I have been fighting this forever.

 

I have replaced the bushings and added a supplemental ground on the OE wiper assembly, also repacked the motor with new grease and used Yamalube on the bushings.

 

The result?  SLOW wipers, no change, drivers side wiper slapping the cowl or the windshield trim.

 

Take #2:

Screw it, decided to pull a wiper assembly from a '00 XJ, soldered the new plug on the body harness side.

Added a buck converter to increase voltage to the circuit in the fuse box.  (16V too much, lol)  VERY FAST WIPERS

 

When I replaced the assembly I changed the bushings with the Dorman ones.  The passenger side behaves nicely, the drivers side has a mind of it's own, slapping the cowl one stroke and the windshield molding the next.

 

I am at my whit's end, I need to pull the cowl off and see how this functions while running because this is unacceptable behavior.

 

Any tips I could look into in the meantime while I stew a bit more would help.

[AZJeff]

If the bushings are new, then the only other possible source of slop is the arm shaft itself being loose inside its body mount.   On an 87 vehicle, that quite feasible.

[knever3]

There was some play in the assembly I couldn't figure out how to get tightened up, so maybe someone yanked on that wiper arm in it's previous life and screwed it up.

[AZJeff]

6 hours ago, knever3 said:

There was some play in the assembly I couldn't figure out how to get tightened up, so maybe someone yanked on that wiper arm in it's previous life and screwed it up.

The fix there is a new (used, good condition) wiper arm shaft assy. from a junkyard