Question about 1999 Oldsmobile Silhouette

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Electrical/Rear Lights My rear left break light dims when i step on brake. When i put car in reverse rear left lights go out except for reverse. When i put the left turn signal on & step on brake light keeps fluttering fast and goes back to normal when i release brake.

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You have a short posiibly in the socket itself because you are forcing your brake light power into your park light. This can also happen if you have a bad or no ground on that socket. If you found this helpful, please post as so. I was a mobile mechanic/electrical and would love to live caht about it

Posted on Jan 10, 2009

  • bob collins
    bob collins Jan 27, 2009

    Never found out if you got it fixed. Would like to get to fixya. TY

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{: ) Looks like your lightings got haywired. Have you had vehicle repairs recently? Anyway, it seems that you have poor grounding connections for the affected lightings. Some circuits share common ground, and ground terminals are strategically distributed on the vehicle. If these grounds don't have good contact with the body, chassis, or engine ground, circuit functions are badly affected. Thats why these ground points should be inspected and kept clean and tight, maintain that good wire and terminal contacts.
We can start with G100 located at the Left Front of the Engine Compartment on the left front body mount. See diagram below:


wyet_helps_24.gif Check out also G401 which is located in the chassis harness, mounted to the left rear Body mount. This ground point is shared by the rear lamps like the brakes, reverse, and rear signal lamps.
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Almost certainly a bad earth in your left hand rear light somewhere.
Clean the earths up REALLY well, ( like silver shiny metal ) and put a new end on the wire to be sure.
You can test it by grounding one end of an extra wire on a really good contact point on the chassis and getting someone to hold the other end on the common earth contact for your rear left blinker, stop light, reverse light and tail light while you try it again.

Definitely not getting a proper earth somewhere.

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If there is evidence of water in the taillight lens, go for the bulbs and their sockets first. Clean, clean, clean.

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