Question about 1989 Chevrolet C1500

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1989 c1500 1/2 ton 350. Left rear brake lite comes on, and then dims to off....What's my problem? Do I have a bad ground, of bad battery lead? Thanks.

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The problem is most likely right in the left tail light assembly.
Check the connector at the light and the bulb sockets.
You will find a bad connection for the power or ground.
Also.....while you are there.....add a ground from the bad light to the truck body.
A length of wire slid into the side of the light socket ....do not let it touch the bottom terminals .....then install the bulb......and then connect to a ground on the truck......will work.

Do the other side too......it will be looking for ground soon to.

The other option is to replace both assemblies........just make sure the connectors are perfect.

Posted on Sep 27, 2009

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Posted on Jan 02, 2017

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Brake lights don't work when headlights are on. When brake is pressed turn signals go fast and when brake is pressed when headlights are on they are so dim you can't see them plus turn signals...


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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.
If possible check also other ground points that you may visually come across while on your search. Be sure also that fuses are all inspected good.
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1 Answer

Oem Radio installation


*** 91 park ave with delco bose =

black = ground
dark green = lights on input
grey = panel lights
pink = on input
yellow = power input
orange = battery power input

nca = shield ground
tan = left fr spkr +
orange/black = left & right spkr -neg
lite green = right fr spkr +

nca = shield ground
dark blue = right rear spkr +
dark green/yellow = right & left spkr - neg
brown = left rear spkr +

purple/white = display dim output
pink = vehicle speed input
-----------------------------------------------------------------------
**** 91 park ave without delco bose =

purple/white = display dim output
pink = vehicle speed input

grey = left front - neg
tan = left front + pos
dark green = right front - neg
light green = right front + pos

black = ground
dark green = display dim signal
grey = panel lights
pink = power antanna
yellow = ign input
orange = battery power
light blue = right rear - neg
dark blue = right rear + pos
yellow = left rear - neg
brown = left rear + pos .

there YA go

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