There are only three wires that go to rear lights, one is tail/license lights, the other two are turn/brake lights. GM ran the brake light thru the turn signal, if they hadn't then the brake would be on the rear lights all the time and you wouldn't have turn signal. The turn signal switch has six contacts flasher, brake, and four contacts for the rear lights. Two of the contacts for rear lights are turn and two brake. There are two leaf spring contacts one for each side, that short contacts. The brake contacts are always shorted, when signal for a turn the leaf lifts from the brake and shorts the turn. It's all in the shop manual, well in the 64 up supplement anyway. 8-)
Larry
Last edited by LGriffin; 11/19/2007 2:10 AM.
