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Re: [T3] Wiper motor

On 21 Oct 2005 at 11:14, Smith, Ethan Nicholas wrote:

> I have checked out my wiper motor, inspected all the linkage and all
> that.  I even rewired the wiper motor.  It still brings on the generator
> light when I turn it on.  I have got to have a voltage drop or
> something.  If I have lights, blinkers and radio all on when I turn on
> the wipers, the lights get dim and the radio kicks off.   I am thinking
> about replacing the wires on my charging system. 

The light is wired between your generator output and the part of the fuse box 
that is energized by the ignition switch. The light goes on whenever there is 
enough of a voltage difference between those 2 points to light it up. Normally 
both points are at about 14 V so there is no voltage difference between them.

If turning on your wipers makes the light go on, it probably doesn't mean that 
there's something wrong with the wiper motor. It probably means that either 
there is too much resistance between those points, so that the extra current 
drain produces a significant voltage drop, or that there's too much current, 
which has the same effect, or that the generator is having trouble putting out 
enough current to keep up with this demand.

You should look for this voltage drop and find out where it occurs. It may be 
in the ignition switch, or you may find that the generator voltage drops when 
this happens, or maybe the wiper shaft bushings need to be lubricated so that 
the motor doesn't have to work so hard.

Jim Adney
Madison, WI 53711-3054

List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org

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