Determining output speaker impedance

[longle SWL]

I'm working on a much modified BC-342. Originally there were 5 flap-door plugs on the right side. This one only has 2 left. Counting down from the top #1 and #3 are still there. One is marked "Phones 2nd Audio" and one is marked "Speaker 2nd Audio". I have no idea if these 2 are even connected as originally. Is there a way to determine what the output impedance of each jack is?

To complicate matters, the LS-3 speaker for this has an 8000ohm tranny but later models of the BC-342 were switchable between 4000ohms and 250ohms for the headset. I don't know that this has that capability but I don't want to plug the wrong thing into the wrong jack. Any suggestions or guidance?

[W7TFO]

Generally, plug away without worry.

The most that happens is the level is too low.

You might test the connector for B+ before plugging in a speaker, but there wasn't any originally.

73DG

PS...those jack covers were always called 'toilet seats'

[longle SWL]

PS...those jack covers were always called 'toilet seats'

Learn something new every day!