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Surging lights

Tiny
JOE0621
  • MEMBER
  • 2000 MERCURY COUGAR
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 190,000 MILES
All my lights on my 2000 mercury cougar are surging, I have unhooked the positive terminal on the battery to test the altenator, what could it be
Thursday, February 10th, 2011 AT 7:56 AM

2 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Firstly you should never undo the battery terminal with the engine running, the voltage spike created when touching it back on can do serious damage to the ECU, now, I would be getting the alternator checked as this may be a faulty voltage regulator, the surge in the lights may well be the voltage increasing and decreasing due to a faulty reg, start here.

Mark (mhpautos)
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Thursday, February 10th, 2011 AT 10:22 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Also a dimmer and headlight switch -as advised with the voltage regulator can be integral with the alternator or the alternator's field generation of the alternator is being controlled by the computer
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Thursday, February 10th, 2011 AT 10:57 AM

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