assuming the bulb out sensor is ok
start with checking brake lights fuse 4
check for +12vdc at fuse with brake peddle down
meter ground to cigar lighter ground
+12v meter lead to leg on top of fuse check both legs

test your brake switch
+12vdc at left brake light yellow/red wire
+12vdc at right brake light yellow wire

give the grounds at each brake light an eyeball.


if the the brake lights still are kaput reconfirm the you have continuity from the
brake switch common line to bulb out sensor common leg 54S/9 and the other three legs 54L/10 54R/11 S/5 reflow the common leg if all 3 brake lights kaput.
then check continuity common to each leg with your ohmmeter.

it's tough to read this pdf. the numbers are not so clear.

bill