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If it works when the lights are off but not when they're on, you probably have a grounding problem. Make sure the ground wire of the bulb is connected solidly to the vehicle frame. Also verify that the connectors are not corroded.

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Q: Why doesn't your 1989 240 dl passenger side brake light not work when your headlights are on?
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Related questions

When I turn on the headlights and step on the brake the driver side brake light goes off The passenger light works fine but When I turn the headlights off the driver side brake light works fine?

check your parking light grounds,lights are trying to ground back thru the circut .common to lose ground in the light socket or even a shorted bulb. most part stores have replacement sockets


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