A quick way to find out which pair of wires go to which speaker is to use a 9V battery. Just a fast touching to any pair of wires will give you a loud pop from those speakers. Note, I said a quick tap. Do not connect anything!
Craig and Susan
Morgan Hill, CA 2007 Newmar Kountry Star 3910 towing a 1998 Ford Explorer. RVing since gas was 58 cents a gallon. Amateur Radio Operator (W6ADV) since 1962.