Voltage at Power Window motor too high?
Thread Starter
Racer
Joined: Oct 2007
Posts: 270
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From: Chapel Hill NC
Voltage at Power Window motor too high?
14.2 at the electrical connector that plugs into the motor.
Is this too high?
This morning, the new motor just stopped working. It is about 4 months old. This happened once before... and when I replaced the alternator the power window motor starting working flawlessly.... so I assumed that it was a problem related to that.
My electrical system is working great and the voltage from the alternator is every bit of 14.6.
I was concerned when I got the 14.2 reading at the electrical adapter that this might point to an issue I have yet to locate.
Maybe the window switch is whacked - causing too much voltage to go to the window motor?
Is this too high?
This morning, the new motor just stopped working. It is about 4 months old. This happened once before... and when I replaced the alternator the power window motor starting working flawlessly.... so I assumed that it was a problem related to that.
My electrical system is working great and the voltage from the alternator is every bit of 14.6.
I was concerned when I got the 14.2 reading at the electrical adapter that this might point to an issue I have yet to locate.
Maybe the window switch is whacked - causing too much voltage to go to the window motor?
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
The 14.2 volts will not cause a problem with the window motor. I think the alternator and the window motor problem are not related, other than they happened coincidently. The window motor not operating is most likely due to bad/carboned-up switch, wiring problem, or defective circuit breaker. 14.2 volts is the normal 'hi-level' voltage for an alternator trying to feed a depleted battery. If your voltage stays at that level after the battery is charged, the 'sensing' circuit wiring is not connected properly and the alternator "thinks" the battery still needs charging. (The sensor wire detects actual voltage from the battery and regulates charging voltage based on what it sees. If that wire is not making good connection, the alt is reading "0" volts on the sensing line and causing the alt to go to max. charge voltage by mistake.)
P.S. Running your alternator in this mode for extended periods of time will tend to 'fry' the alternator fairly quickly.
P.S. Running your alternator in this mode for extended periods of time will tend to 'fry' the alternator fairly quickly.
Thread Starter
Racer
Joined: Oct 2007
Posts: 270
Likes: 0
From: Chapel Hill NC
Where is this sensing wire connected? (#2 in the diagram below?)
Last edited by 81_vette!; Apr 4, 2011 at 04:18 PM.
Thread Starter
Racer
Joined: Oct 2007
Posts: 270
Likes: 0
From: Chapel Hill NC
Resolved...
Well all the electrical tested out and I could not locate any issues between the motor and the electrical system.
So, I re-adjusted the window regulator and Bam!... we were in business.
Seems I have an intermittent "binding" issue with the regulator.
So, I re-adjusted the window regulator and Bam!... we were in business.
Seems I have an intermittent "binding" issue with the regulator.
