2003 Jeep Liberty Speaker Polarity

Does anyone know the polarity on the speaker wires of a 2003 Jeep Liberty.

Thanks,

Casey

Test for voltage across the positive and negative speaker wires coming from the head unit, while it is powered up.   Positive voltage means the wire touching your red test lead is the positive wire; negative voltage means the wire touching your black test lead is the positive wire.

Only other way is to use a speaker popper and look at the speaker, if the cone moves outward then the battery's positive connection is the positive speaker wire; if it moves inward the then it's the negative connection that's the positive speaker wire.