I was going to do the same swap on my 00 Silverado....
I'm told you need the LH & RH lens... Bolt in.. OK
But 03 lens uses 4 bulbs... Not 3 as in 00-02
Therefor you also need both the LH & RH short
03 wire harnesses that are plug in too...
Your bill could be $160 or so with discount prices...
Den in WI
Here's one I know about! I switched the ones on my 99 Z71. The wire colors
are not all the same but the wire functions are the same. I hated those jap
turn signals so now my lenses are red. The top is a taillight/brake, the
center is the turn signal, then the backup light. The difference is that
extra light on the bottom. The lense isn't visible from the side, so GM in
their wisdom, put one of those side facing taillight that blinks with the
signal. The wiring is simple if you have the stuff that came with the 03
lense. The fixtures are a little different but I don't know if the old one
fits the new lense cause I used the 03 fixtures.
OK Michael, The little light at the bottom has a brown wire that goes to
tail lights, and a dark blue wire that goes to the turn signal. Notice that
the existing wiring has 2 pale blue wires on the left side. The top one is
the stop light and the middle one is the turn signal. The new light will
work the same as the old one except - you'll have a red turn signal and that
little light at the bottom will be on with tail lights and blink with
signals. Look at the 2003 fixture. The wiring is pretty simple. The top
is a tail light (brown wire) and stop light (light blue wire). Middle is a
turn signal, (dark blue wire) and the green wire is the back up light. The
brown wire is connected from the top to the little light at the bottom (tail
light) The dark blue wire is connected from the middle to the little light
at the bottom (turn signal). That should make it clear - good luck!
My next attempt is to wire the lights to my trailer connector. I want the
top and the middle to be both stop/turn and tail lights. It might not be
possible because of that little light at the bottom being connected to the
tail light, but I'll find out! The trailer connector doesn't have the logic
circuit that makes the stop and turn two different circuits.
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