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Brake Light Wiring

Tiny
CCSANDY
  • MEMBER
  • MERCURY MARQUIS
I have a 97 Mercury Grand Marquis and am trying to put a brakelight/backup light flashing unit (for EMS service). Which wire is the brakelight wire as there are 3 wires that connect to the assembly.

thanks
Sunday, March 11th, 2007 AT 9:48 PM

4 Replies

Tiny
MIKE H R
  • MECHANIC
  • 3,094 POSTS
One wire would go to the brake ligts, the second would go to the back up lights and the third would go to the power source.
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Monday, March 12th, 2007 AT 9:57 PM
Tiny
CCSANDY
  • MEMBER
  • 2 POSTS
Actually the back up light wiring is completely separate. The tail light/ turn signal/ brake light assembly has 3 wires plus the ground that go into the assembly.

I guess i'll just have to turn them each on individually and test the wire for current.
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Monday, March 12th, 2007 AT 10:32 PM
Tiny
MIKE H R
  • MECHANIC
  • 3,094 POSTS
What kind of flasher is it? I looked in the garage and found one that has 6 wires of course none of them are labeled, let me know what kind you have
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Tuesday, March 13th, 2007 AT 8:56 AM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Are you talking about installing Wig Wag lights like the cops?
If so ya need more than a flashser! You need a solinoid set.
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Tuesday, March 13th, 2007 AT 4:00 PM

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