1992 Oldsmobile 88 Break lights

DAN09

MEMBER
1992 OLDSMOBILE 88
6 CYL
2WD
AUTOMATIC
122,000 MILES

My break lights function correctly until I turn my head lights on. Once I'm driving with my headlights the break light will not work on the left side of the car. Again this is not a problem during the daytime only with the headlights engaged. I have replaced all of the fuses that have to do with the lights with no luck, any suggestions?

3 Replies

JDL

MECHANIC
16,098 POSTS

Hi, does the left turn signal work, at the rear, with headlamps on? The reason I asked, that is a dual filament bulb. One filament for stop/turn, they don't use the circuit at the same time. The other filament, is for tail light, goes hot when you turn on the head lamp switch. Brown wire is voltage for tail lamp-- yellow wire is voltage for stop or turn-- black wire is ground.

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Monday, March 1st, 2010 AT 10:04 AM

DAN09

MEMBER
2 POSTS

All of other functions work in the tail lights on both sides. The running lights work but disingague once the break pedal is pressed, but no break light. I had someone sugest the switch under the dash that recognizes when the breaks are depressed, but it seems to be functioning fine.

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Monday, March 1st, 2010 AT 10:11 AM

JDL

MECHANIC
16,098 POSTS

About all I could do is backtrack the circuit when the problem occurs. You could use a testlite on the brake lite wire, for voltage, when it refuses to work. I gave you the wiring color. If no voltage, backtrack the circuit.

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Monday, March 1st, 2010 AT 3:13 PM