Hello,
I had the same problem with my 75 when I got it. The owner was convinced it was the motor. But when I took the steering wheel off I found the wires were not even plugged in all the way! Dohhh.... They looked like they were half way on, but not making contact. But my turn switch was not working nicely either. So I bought a whole new switch set and that solved everything.
Then I upgraded to a 1972 Steering column to get rid of the VW key the 75 had. So now I have a brand new trun and wiper switch set I don't need.
Check the plug then check the switch. I bet it is one of those.
Take care,
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Christopher A. Landt
1979 911sc
1973 914 2.0
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