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Left brake light not working... help please!!
1999 Buick Regal

Left brake light not working... help please!!

(1999 Buick Regal)
Changed the bulb and socket. tested bulb and socket both are fine. I read the meter voltage at the socket and could see it increase to about 12 v when the brake was pressed. When I put the bulb back in nothing happened and the reading went to zero volts. Blinker and running lights all work fine. Right blinker works fine too.
2 answers & 2 comments
Popular Answer
on May 31, 2014
Signal light (multifunction) switch is a prime suspect... even though the signals still work!!... Brake light circuits go through this switch before they go to the rear so the switch can stiil signal while brakes are on... sounds crazy don't it....!.... So, if the "blinker" still works then wiring and bulb are OK.....same circuit... the signal switch just breaks this circuit when needed.... but now it does it when not needed.... can be either one if the brake lights that doesn't work!........ I hope this helps....
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on May 31, 2014
yes.. Thank you. I thought it might be this but hoping it wasn't. Those multifunction switches are expensive!
on May 31, 2014
ebay!.... < $50.00... new!!
General Diagnosis
$88 - $111 Learn More
on May 31, 2014
Signal light (multifunction) switch is a prime suspect... even though the signals still work!!... Brake light circuits go through this switch before they go to the rear so the switch can stiil signal while brakes are on... sounds crazy don't it....!.... So, if the "blinker" still works then wiring and bulb are OK.....same circuit... the signal switch just breaks this circuit when needed.... but now it does it when not needed.... can be either one if the brake lights that doesn't work!........ I hope this helps....
Sign in to reply
on May 31, 2014
yes.. Thank you. I thought it might be this but hoping it wasn't. Those multifunction switches are expensive!
on May 31, 2014
ebay!.... < $50.00... new!!
on May 31, 2014
Ground? Worn contact?
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