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Author Topic: 1976 gmc wipers on all the time with key on  (Read 2859 times)

Offline kcwis

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1976 gmc wipers on all the time with key on
« on: December 28, 2016, 02:32:00 pm »
Even with the wiper sw disconnected they stay on,  thought sw had to be grounded but dash sw is plastic,not equipped with delay, washers work fine,hi-low works fine.Ran external ground from motor to battery,no difference.
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Offline VileZambonie

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Re: 1976 gmc wipers on all the time with key on
« Reply #1 on: December 28, 2016, 08:54:37 pm »
Replace the wiper motor
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Offline blazer74

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Re: 1976 gmc wipers on all the time with key on
« Reply #2 on: December 28, 2016, 09:59:23 pm »
The motor is key on 12v hot all the time. The switch controls the ground. The motor is getting a ground somewhere and staying on, probably internal.
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Offline hatzie

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Re: 1976 gmc wipers on all the time with key on
« Reply #3 on: December 29, 2016, 04:48:19 pm »
Usually that means the park cam has failed inside the motor. 
The armature plug will have three wires.  Power with the ignition and HI LO grounds with the switch. Check the HI and LO wires for continuity to ground with the switch off.  If they're dead, infinite ohms, change the motor.

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« Last Edit: December 29, 2016, 05:48:48 pm by hatzie »
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