transmisson problem

2002 MITSUBISHI GALANT
157,000 MILES • 2.4L • 4 CYL • FWD • AUTOMATIC
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REDBONE
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  • 105 POSTS
When I have my headlights on and put the transmission in drive the car wont move forward, but if I have the headlights off the car will move forward.
Apr 27, 2016 at 2:15 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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STRAILER
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 54,178 POSTS
Hey redbone,

This is a good one, have you checked all of the fuses?
Apr 28, 2016 at 10:57 AM
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REDBONE
  • MEMBER
  • 105 POSTS
no I haven't yet...I will check them
Apr 28, 2016 at 3:39 PM
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REDBONE
  • MEMBER
  • 105 POSTS
checked all fuses they are good
May 9, 2016 at 9:33 AM
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STRAILER
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 54,178 POSTS
I checked the wiring diagram and they don't seem to feed each other, but please remove the headlight bulbs and retry the transmission operation, I'm thinking the system may have a bad ground which is back feeding into the transmission controller.

I have included a diagram as well
Image (Click to enlarge)
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May 10, 2016 at 12:02 PM