I used 2-wire lamp cord, directly from both poles of the battery. All indicators are that the pump died.

 

You haven't replaced it yet?

 

I once tested my rear wiper and pump shortly after I bought my Blazer brand new back in 2000. Came to the determination that I didn't need either as the only thing it did was give me a clear view of my spare tire. Haven't tried them since.

But great info if I ever decide to move the spare and want to look out the back window!

 

Not yet. More of a convenience than a necessity.