Was: Odd Problem #587 (Wipers) Now: Thanks for Playing

Brett Dikeman brett at cloud9.net
Thu Jun 27 17:36:30 EDT 2002

At 3:18 PM -0400 6/27/02, Djdawson2 at aol.com wrote:
>[ Picked text/plain from multipart/alternative ]
>Yes, that will solve that problem.  Basically, the wiper motor regulator arm
>moves like a crankshaft in the engine.  Your wiper motor is stopping (when
>you turn it off), but the arm is not at BDC, so to speak.

If the arm is not properly adjusted, why does it reach all the way to
the bottom of the windshield during "on" operation, according to
Paul's description?

When you switch the wipers off, the only thing that powers the motor
to get the wiper back to its home position is a set of conductive
tracks inside the wiper mechanism.  There are two such tracks; one
handles the extend, the other handles the retract

There is a break, or some dirt/carbon on the retract track, and when
the wiper tries to return, powered off that track instead of the
wiper switch/relay, it stalls.

The other("extend") track powers the motor in the same direction
until it hits the end of the travel...which is where the "retract"
current track causes the wiper to return back.  The tracks are
probably on a gear which turns once per complete wipe cycle.

If you adjust the arm 1/3rd of the way further counterclockwise,
you'll end up with the wiper blades reaching about 2/3rds of the way
up the windshield and 1/3rd of the way into the $60 rain cover :-)

"They that give up essential liberty to obtain temporary
safety deserve neither liberty nor safety." - Ben Franklin

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