on the front door of a 2000 camaro, which speaker wire is positve the dark green or light green?

its tough to say, cause almos every car is different. but usually if one wire has any writing on it it is the positive. However your best bet is to get a wiring diagram off the internet for that year.

from installdr
dash cd player
A Left Front Spkr (-) Light Gray - White w/ Black Stripe
B Left Front Spkr (+) Tan - White
C Right Front Spkr (-) Light Green - Gray w/ Black Stripe
D Right Front Spkr (+) Dark Green - Gray
F Not Used
G Headlight Dimmer Wire Gray - Orange (if available)
H Power Antenna Turn On Pink (if available) - Blue
I +12 Volt Ignition Wire Yellow - Red
J +12 Volt Battery Wire Orange - Yellow
K Right Rear Spkr (-) Light Blue - Purple w/ Black Stripe
L Right Rear Spkr (+) Dark Blue - Purple
M Left Rear Spkr (-) Yellow - Green w/ Black Stripe
N Left Rear Spkr (+) Brown - Green