I have an 03 chevy truck, when I apply the brakes the 3rd light on the cab comes on but the other two will not. I have replaced the bulbs,fuses, brakelight switch, the multifunction switch & see no dammage to the harness. What else is there to do?
3 Answers
check the wires themselves that run from the harness to the back taillights check voltage and resistance and look for an open circut or broken wire
your 4 way flasher may be bad ...
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then theres always the obvious , do you have a bad ground ? do the 4 ways flash ? you got right and left turn signal ? if yes to both you missed a switch somewhere .