how is door grounded? - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 7 (permalink) Old 05-23-2011, 10:13 PM Thread Starter
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how is door grounded?

I have an annoying intermittent issue with my driver's door window. Sometimes it doesn't work. When I start fussing with the door, the window suddenly works again. So I checked the switch and wires. But it turns out I only get partial voltage unless I connect the door to a good ground like the seat belt anchor or the ground in the switch block.
The only ground wire I could find in the door goes to the window switches and they are only connected to the trim. So is the ground path from the door just through the hinges? Either way, how could I be getting a poor ground in just the driver's door?

1996 F350 CC, converted to 4wd, 5sp, Tymar, otherwise stock as the day it was built.
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post #2 of 7 (permalink) Old 05-23-2011, 10:30 PM
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Re: how is door grounded?

Run another wire through the wire bundle. Ground one end to the body under the dash somewhere. Ground the other end to the door metal somewhere. See if that fixes the issue.




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post #3 of 7 (permalink) Old 05-24-2011, 12:19 AM Thread Starter
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Re: how is door grounded?

Yeah. I guess that's what I'll have to do. That fixes the problem now. So if I wire it in the door, it'll be a good long term test.
I'm still curious what the designed ground path is. Because I'm curious what has changed so that I only get about 6 volts until I improve the ground. I don't have any rust or anything.

1996 F350 CC, converted to 4wd, 5sp, Tymar, otherwise stock as the day it was built.
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post #4 of 7 (permalink) Old 05-24-2011, 02:26 AM
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Re: how is door grounded?

A power window motor has two wires, the window switch reverses the polarity of the two wires to change direction, the ground is the third wire on the window switch.

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post #5 of 7 (permalink) Old 05-24-2011, 01:45 PM Thread Starter
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Re: how is door grounded?

Quote:
Originally Posted by toolmangary View Post
A power window motor has two wires, the window switch reverses the polarity of the two wires to change direction
Right, sorta. At least on mine anyway. The switch sends 12v+ to one wire when the up portion is pressed and 12v+ to the other wire when the down portion. But a ground is not present in either one.
If I measure across the two wires at the switch or at the motor when the switch is pressed, I can't measure any voltage. But I can if I measure from the energized wire to a good chassis ground.
Maybe if the ground is supposed to be switched to the opposite wire. I might have a problem in my window switch.

Quote:
Originally Posted by toolmangary View Post
the ground is the third wire on the window switch.
Huh? There's only two wires. Like you said up ^^^ there.

Thanks for helping me think though this guys.

1996 F350 CC, converted to 4wd, 5sp, Tymar, otherwise stock as the day it was built.
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post #6 of 7 (permalink) Old 05-24-2011, 02:09 PM
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Re: how is door grounded?

TWO wires on the MOTOR, THREE wires on the SWITCH (internally).

Actually, two of the three wires on the switch go to ground, the third is the power. When you press the rocker to UP, the switch puts power to one motor wire and ground to the other, causing the motor to turn in one direction. When you press it to DOWN, it puts power to the second motor wire and ground to the first, causing the motor to turn in the opposite direction.

In any event, ground is through a separate ground wire in the harness going through the bellows between the door and cab. That wire is probably broken somewhere.
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post #7 of 7 (permalink) Old 05-25-2011, 03:19 PM
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Re: how is door grounded?

^^^ Yep, thats the best way to explain it

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1999.5 Jetta TDI 11mm pump S7 PP764's 3bar MAP
1986 F350 CC Dually 6.9 ATS turbo lowered
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1970 Cuda 426 4sp Dana 60
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