transmission not changing when lights are on

1992 LEXUS LS 400
192,000 MILES
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SHAY0653
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  • 1 POST
during they day it drive fine but at night when its time to drive with the lights on the rpm hand goes up and it want change gears not unless i cut the lights off and when i cut them back on it go back doing the same thing the transmission want change
Sep 13, 2011 at 6:57 AM
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KHLOW2008
  • ✓ASE Certified Mechanic
  • 41,814 POSTS
  • ASE Certified Mechanic
Have the charging system checked. Another possible cause is a bad grounding circuit which is being affected by the headlights.
Sep 13, 2011 at 12:12 PM
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MHPAUTOS
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  • 31,937 POSTS
  • ASE Certified Mechanic
This may be a bad earthing problem, i would start with the battery earth and the body earth points, has the car been in an accident or had any electrical work done recently?
Sep 13, 2011 at 12:13 PM
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