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Brake lights not coming on, but 3rd brake light works

49K views 14 replies 9 participants last post by  57diesel  
The third brake light is powered directly by the brake switch. The regular brake lights go thru the turn/hazard switch. If turn signals work and you said the 4-ways worked, then you probably do need a new MFS.
 
Welcome.
How much of the 97 wire harnesses did you swap to the 98?
What engine did the 98 originally have?