[Two radios on one antenna]

Do you need the ability to change channels or just the ability to monitor and transmit on the selected channel? 

[Brand new to GMRS and may have killed my radio trying to set it up.]

Might have smoked the reverse polarity protection diode?

[TK-8180 30 pin ribbon cable availability]

I believe one ribbon is for the KRK-10 and the other is for a front mount configuration. 

[New gmrs radio for my semi]

Look up molex connector 03-06-6155. Maybe that is what you need?

I think that was wrong, I think you are looking for a Molex 03-06-2151.

[New gmrs radio for my semi]

 

Yeah, I got a TK-880H(1). At first it seemed nice they didn't cut off the power connector. But it took awhile to find the right mate online. All the power adapters I was finding were of the T-type variety. I'll know in about 4 days, if the one I found is the right type. Else, I'm just going to cut ends off and apply new Anderson plugs and be done with it. Wish I could find the mate for the accessories plug.  But it seems like Molex Incorporated has ceased making it "76650-0070". Couldn't find if another company makes it.

molex incorporated 76650-0070

 

Look up molex connector 03-06-6155. Maybe that is what you need?

[Quantar build]

Maybe referring to the pre selector having a 4 MHz pass? I dunno, a bit confusing to me too. I have 20+ Quantars in service and they are work horses.

[Here with another TK880 issue]

Have you tried reading another radio that doesn't have a password and program it into the password protected radio?