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Re: Windshield Washers
Posted by Unknown Sender (more from Unknown Sender) on Thu, 6 Mar 2003 20:50:39
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

Re 18614, a voltmeter is not much of a load, it only measures voltage, it 
will not show high resistance connections (poor ability to carry current for 
a load).  It probably takes at least and amp or two of current at 12 volts to 
run the motor, you have to have both.  Try putting the meter across the pump 
while connected to the harness while energized and you probably will see only 
a few volts, not enough to run it.  That means either the feed side from the 
battery has a weak connection somewhere, or the ground side back to the 
battery has a weak one.  Now hook the - (minus) side of the meter to the 
negative pole of the battery and check the voltage at each the connections at 
the pump.  The ground side of the pump should read close to zero volts and 
the positive side should be up around 12.  If ground side reads high, poor 
ground, if supply side is low, poor supply connection (switch, fuse etc.)  
Good luck. Let us know if you find it.

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