Transmission not changing when lights are on

Tiny
SHAY0653
  • MEMBER
  • 1992 LEXUS LS 400
  • 192,000 MILES
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
Tuesday, September 13th, 2011 AT 6:57 AM

2 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Have the charging system checked. Another possible cause is a bad grounding circuit which is being affected by the headlights.
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Tuesday, September 13th, 2011 AT 12:12 PM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
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?
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Tuesday, September 13th, 2011 AT 12:13 PM

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