Why does the starter engage when I step on the brake or turn on the right turn signal?

Asked by Nov 11, 2016 at 06:48 PM about the Ford F-250

Question type: Maintenance & Repair

I was attempting to install a Trailer Brake Controller on my 1987 Ford
F250. I mistakenly crossed the wires on the positive and negative posts of
the battery and when I hit the manual button  on the controller the starter
engaged and continued turning until I disconnected the battery. I
disconnected all the wires I had connected but now when I step on the
brake or use the right turn signal the starter engages. Help!

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