Which Wires Which?

[Hubie]

Hey guys, replacing my front and back door speakers on my nbs sierra, and I will need to cut the factory connector to solder the new wires to the stock ones and I cannot tell which is positive, and which is negative?? One wire is a dark solid blue, the other is a light solid blue. Anyone have any ideas??

[knightr]

If you have the Base system on GMT900, the schematics show the L-BU(-) & D-BU(+).

[thecraft]

Left Rear Spkr + BN

Left Rear Spkr - YW

Right Rear Spkr + D.BU

Right Rear Spkr - L.BU

Left Front Spkr + TN

Left Front Spkr - GY

Right Front Spkr + L.GN

Right Front Spkr - D.GN