Cannon mini mag a wont go down

[Kayakhank]

I am having a problem with older cannon mini mag a.  It goes up but won't go down.  

I may have sent too many volts through accidentally..  I get continuity when i move the switch up and down.  I assume the switch just changes positive negative so the motor works up and down.

Any ideas would be helpful.  I can drop using the clutch but not the best long term solution.   Appreciate any advice.

H