start with the basics: power to coil and starter relay. Start adding circuits after that. Sometimes its easier to start from scratch than reverse engineer a birds nest.
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Somewhere I have an old photo of the phone room at the Spokane public safety building. It's a fairly big room in a concrete building with what might be called "free standing" plywood partitions, 8ft tall, and covered on both sides just about every square inch with 66 blocks These are not only building phones, but things like remote controls for doors (the jail and others) alarms, two way radio audio and remote control, you name it, low voltage anything. Intercoms, of course. I don't remember if video goes through there or not. Last time I was there was about 98. The county has a "many channel" microwave system that operates on several mountaintops in a circle. This of course is for redundantcy if one fails the rest are still linked. It carries various radio/ audio/ remote control functions, such as repeated audio from multiple receivers down to public safety to a "voter" and then the "voted" audio goes back out and up to whatever mountain the repeated system transmitter for that channel is on
And not all the radio audio is on the microwave "natively" either. Some systems are on telco rented "dry pair" some on fiber, and some on uhf radio links. For example, we had three repeated channel receivers up on Deer Lake Mountain, but no microwave or phone lines available. So that audio is radio linked via 3 24hour full time low power transmitters down to three more receivers at the Deer Park water pumping station, where those receivers transfer the audio to rented pair. That goes somewhere and gets to fiber, and THAT goes somewhere to get back into the microwave, where it finally gets shot down to public safety. And to the voter for those channels.
Confused? So am I and I helped install some of it
One of the radio sites is REALLY interesting, it's on Lookout Point. The radio room is an old USAF underground bunker for some of their old cold war RADAR
I rattled some cages when I pointed out that one of the remaining radomes.......made of nothing but RADAR transparent composites......has a communicating hatch to the bunker, and all some hoodlum would have to do is casually take an axe to the radome, and they would have full access to many radios.
See if this works
Google Maps
If not here is a screenshot. My mouse is pointing to the radome. The "sticking out" is the 4 radomes on a concrete shell. What looks like a big building roof next to it is the top of the buried bunker. It is fenced You can see the tower "coming up to you" LOLOL
