"Saboteur" (1942)
http://www.imdb.com/title/tt0035279/
"Tobin has called the sheriff, but Kane escapes the police, taking refuge with a kind blind man (Vaughan Glaser) whose visiting niece, Patricia "Pat" Martin (Priscilla Lane), is a model famous for appearing on billboards. Although her uncle asks her to take Kane to the local blacksmith shop to have his handcuffs removed, she attempts to take him to the police. Kane insists he is innocent and kidnaps Martin. When he takes control of the car and stops, she jumps out and tries to signal a passing car to stop. He uses the fan belt pulley of her car's generator to break his handcuffs apart, causing the car to overheat and break down."
You can watch the complete movie here:
https://www.youtube.com/watch?v=ltR06Qp1C34
At 0:28:36 : The guy on the run arrives at the blind man's house.
At 0:39:00 : He uses the car's generator to break the handcuffs apart.
I am sure this is your movie. If you agree, then please select my answer as Best Answer by clciking on the yellow star next to it.