Electronics Need help wiring something up? Thinking of adding an electrical component to your car? Need help troubleshooting that wiring glitch?

3wire and 2 wire headlamps

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Old Jul 23, 2004 | 08:44 PM
  #1  
MuscleMadness's Avatar
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Car: 1989 Trans-Am
Engine: 305 TBI
Transmission: 700-R4
3wire and 2 wire headlamps

Is there a way to make a 3 wire headlight motor work with a 2 wire plug? Is the extra wire just a ground or what?
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Old Jul 24, 2004 | 11:24 AM
  #2  
MuscleMadness's Avatar
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Car: 1989 Trans-Am
Engine: 305 TBI
Transmission: 700-R4
bump
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Old Jul 24, 2004 | 12:54 PM
  #3  
Petes 84Z28's Avatar
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Joined: Jul 1999
Posts: 1,593
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From: out of my mind; be back in 5 minutes....
Car: 1989 Firebird Formula
Engine: Internal Combustion
Transmission: Completed
Axle/Gears: ones that turn.
Not easy to do.
The 2-wire system simply reverses polarity to operate, like a power window motor. The 3-wire system reverses polarity on only one wire, and alternates the opposing current flow between the other two wires, depending on the direction of travel needed.
Something like this...
Up:
1) +
2) -
3) no power

Down:
1) no power
2) +
3) -

It could probably be done using a couple of relays, but would be easier to just sell the 82-86 style motors and acquire the 87-92 style that will plug right in.
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Old Jul 24, 2004 | 02:20 PM
  #4  
MuscleMadness's Avatar
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Car: 1989 Trans-Am
Engine: 305 TBI
Transmission: 700-R4
Ahh i c...

I bought my assembly on ebay and it came with the older motor. I really needed the whole assembly more than the motor but my old motor runs but it doesnt open the light. It just turns. I think the gear is stripped or something. I sure had a hell of a time getting the headlight to fit right. It's still a little crooked, but at least it's level with the hood. I had to take it out 2 times to adjust it. What a pita!

Thanks for the help. If anyone wants to swap motors shoot me a mail.
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Old Jul 24, 2004 | 06:19 PM
  #5  
Petes 84Z28's Avatar
Supreme Member
 
Joined: Jul 1999
Posts: 1,593
Likes: 3
From: out of my mind; be back in 5 minutes....
Car: 1989 Firebird Formula
Engine: Internal Combustion
Transmission: Completed
Axle/Gears: ones that turn.
Check out one of the board's sponsors, Top-Down Solutions, for parts to repair your malfunctioning motors.
http://www.top-downsolutions.com/pro...products_id=35 or http://www.top-downsolutions.com/pro...products_id=87
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