I'll post a pic of the connector once I get it apart. I'm betting fluid dripped onto the connector over the time it was sitting and corroded the connector.

UPDATE: the connector is a oval rubber style connector with 2 pins (+12V and ground I presume). I cleaned the pins on the motor with some fine sandpaper
and did the same to the rubber female recaptacles in the plug. added a bit of dialectric grease....put back together and working great again.

 

2026!
Same thing here. Power probe gets the motor turning and spraying so it is in the switch or connection.
Unfortunately I am without a helper to push the sprayer button for me to check voltage!

Edit: Was able to reach it just barely. Power to the pig tail when the button is pushed.
Squished the female connector a bit, added some new dialectic grease, plugged it in and Bob's your uncle. All is good.

 

And that is why I like to use a test light. A jumper wire with clips to hook it to plug & light. Sey light were you can see it when you push the button. If it lights up you got power to the plug.
Dave ----