I'll guess you put the connectors back together wrong.
Yep, a multi-meter is a useful tool.
Back in the day we had these little store bought test lights.
Further back in the day we would make a test light with a 6-V light bulb and two pieces of wire.
Before that, we would wear a "car coat" in the wintertime.
Racoon coats worked good back in the buggy days.
Got to go, it's time fer ma meds -
humfrz