pull up the sill and carpet on either side (passenger or driver) and you will see 2 round, black, rubber plugs in the floor. i made an "X" cut in one of mine and brought the wires in there. after i got them in , i used black Permatex on the plug to reseal it, then put the carpet and sill back.

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1983 Ranger, reg cab, short bed, 2.8, 5 spd, 4.56's, 2" bl, 215/85-16 Treadwright AT's