Tail lights are cutting in and out ( on and off )

It could be the switch. Check this though that I found

Wire broken in wire harness that follows right rear trunk arm. It is a common problem.

https://www.google.com/search?q=2003+Buick+LeSabre.+I+have+no+tail+lights

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Left light
Pink/black tail light
green/yellow stop light
grey/bue turn
black ground
Right
pink/black tail
green/yellow stop
grey/red turn
black ground

Had almost similar problem with one tail light. Get out of the carf while lights are on. Bang gently on the defective light and it may come on. Mine did. Probably loose connection.

I would check your tail light fuse first then test the brown wire in the tail light harness where you origionally cut into it. With the lights on there should be around 12v on it. if not you may have pulled the wire too hard and broke it upstream. Test to see if there is 12v at the fuse ad if there is, your trouble should be in the wire between the fuse and the spot where you cut into it.

Rear iignts in rear na, removing and instaiiing

Fig. 325: Rear Lights In Rear Lid, Removing And Installing

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Removing

CAUTiON: • Switch off all electrical components.

. . Switch ignition off and remove ignition key.

o Turn light switch into "0" position.

o Open cap - 1 - for warning triangle.

o Rotate quick-release screw - 2 - counter-clockwise 90 C and remove cover - 3 - from luggage compartment lining - direction of arrow -

Fig. 326: Removing Bulb Socket From Housing, Pressing Catch Bracket Downward

Courtesy of VOLKSWAGEN UNITED STATES, INC.

o Disconnect electrical harness connector

o Remove bulb socket - 1 - from housing, press catch bracket - 2 - downward - arrow - to do so

Fig. 327: Identifying Nuts, Clamping Bracket, Inner Tail Lamp, And Clamp Mounting

Courtesy of VOLKSWAGEN UNITED STATES, INC.

o Unscrew nut - 2 - and remove clamping bracket - 1 -

o Remove nut - 4 - and remove inner tail lamp - 3 - toward outside

o Remove clamp mounting - 5 - from body cut-out

Fig. 328: Identifying Clamp Mounting, Nuts, Inner Tail Lamp, And Tabs

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Installing

Installation is the reverse of removal, noting the following:

NOTE: • Make sure seal between body and tail lamp housing seals properly.

. Attach clamp mounting -2 - at inner tail lamp and screw on nut -3 - loosely.

. Attach inner tail lamp -4 - at body cut-out and make sure grip tabs - arrows - of clamp mounting rest against body cut-out

. Slide clamp mounting - 1 - onto threaded pin of inner tail lamp and tighten nuts - 3 - and -5 -.

If you can see the cut wires then simply join the same color coordinating wires with a crimping style wire connector that you can purchase from WalMart or any auto parts store. Make sure and strip the plastic casing around the wires on both ends before using the wire connector. After the connector has been crimped to both wires, wrap electrical tape around the connector to seal off from water.

first check ur fuses with a good test light see if any are blown did u cut any wires when u took out the old stereo

You probably have a bare wire at the back of your car that is shorting out on the frame, or against another bare wire.

There is a fuse of course. That is wat must have cut off.

most rear tail lights and turn/stop lights are the same dual filiment bulb. it is possible for your tail light to work and your brake light not to and still have a bad bulb. I would check the bulb first, your brake light works on the left yes? this would mean that the fuse is fine