Here is what the book says to check..1.Backprobe the brake switch connector with a test light between term “b†and ground. Is the test light on? YES2.Backprobe same connector with test light between term ‘a ‘ and ground and between term “c†and ground.3.The test light should illuminate at both terminals when the brake pedal is depressed. YESFor high level stoplamp check for an open in CKT20 or ground CKT150If NO for #1 check for open or short to ground in CKT140. Check for open stop/haz fuseIf NO for #2 check for proper adj. of brake switch.Hope this helps..Steve
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