Which cable is common and which is ground for the front spekaers?

 

For one door, I believe red is pos. and on the other door, it's negative for some reason. I don't remember which is which, but if you just hook up a voltmeter to the 2 leads, one will give you a slight reading (in the hundreths) either + or -. If it's +, then the wire hooked up to your red voltmeter wire is the + wire.... just the opposite if the reading is -. Then the wires are reversed. For the door speakers, it doesn't make a heck of a lot of difference anyway as both leads are actually connected to the cone (past the hook-up point). Hope that helps.

The Bamadog
BAMADOG.COM
2004 G35 Coupe - Black/Black 6MT - Chrome 7-Spoke Wheels - Aero Kit & Package w/spoiler - Tint - Alpine System - Body Side Molding

 

Green is positive
Red is negative

For both front doors.

2004.5 DG/G 5AT Coupe with all options
Sidemarker turnsignal mod
GroundingGear™
2003 Yamaha YZF600R