Stop in for a cup of coffee

Testing condensers without a dedicated tester is impossible. Analog multi-meter on ohms scale test one way, then reverse leads. Needle will bump if its not open or shorted.
Depending on meter, battery size matters. 9 volt powered ones are better.
Or just holding on to wire,tag it across 12 volts then hand it to your wife. If she gets a snap then its good...