I recently replaced my steering shaft with one from a salvage yard , nothing wrong with it just the flex joint was stiff .So I sprayed it with PB blaster which is a good penetrating oil I was told . Installed it with a new rag joint from NAPA . Made a jumper wire over the rag joint for a ground connection . Then I tried the horn and nothing . Clipped a jumper wire above the flex joint to ground and the horn works . Re attached the jumper wire below the flex joint to ground and the horn is dead . What did the PB blaster do to the continuity through the flex joint on the steering shaft ? Seems I am going to have to make another jumper wire for ground above to below the flex joint .

 

By 'flex joint' do you mean the slip joint which has a rubber isolator that absorbs vibration? Or the coupling joint which acts like a u-joint?

 

flex joint , u-joint . I wont call it a coupling joint or slip joint. There is the rag coupler joint on the bottom that connects to the steering gear box . I am referring to the top end of the steering shaft