Furuno 1731 Mark III

[H2obio]

and the pin I bought was too short............first step, find the correct pin..........

 

[H2obio]

https://www.digikey.com/en/products...112/15657558?s=N4IgTCBcDaILYCcAOBaOBGdEC6BfIA

looks like this might be the closest round pin contact.

 

[H2obio]

Thank you, I'm getting closer!