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I'm too far away from that Sherman unit but if you ever make it out towards Greenville we have a fairly well active local repeater. https://mygmrs.com/view?id=1525

WOW! I can't believe it, but I got it working. So, it was user error (not at all shocking there!). But, in simple, the accessory connector is upside down compared to most of the other 16 pin radios. Everything I found online states that pin 1 is bottom left while looking at the back of the radio with the heatsink facing down. Apparently, this is WRONG for the M1225 (at least this version of it). I dug through the service manual and found that pin 1 is top right. I checked the ACTUAL pin 8, and guess what.. working perfectly. Hopefully this helps someone else in the future too! If you are using one of the cheap, china no-name repeater cables, the blue pot for RX adjustment needs to be facing UP (towards the top of the radio). I am very thankful that plugging them in upside down didn't blow anything up, since I read online that can easily happen if these things are installed upside down. Mystery solved!

Firstly, glad to finally be here. Been a lurker for a while, and the FCC got back to be a few weeks ago, so now I can key up Back story summed up, I'm working on a repeater for my family using a pair of Kenwood TK-862G/HG mobile radios (the 862G for RX, 862HG for TX @ 25 watts). I know there a lot of 'better' options out there for repeaters and mobiles aren't the best of the best, but its what I've got, so I'm using them. I'm also using Tk-863G for mobile units and looking for TK-3402 HTs, but they aren't 'part 95a'....oh well, still looking. Current situation, I'm trying to interface the two radios using the KCT-19 accessory cable. I didn't want to use the front mic ports, (I wanted a clean look in a cabinet) I figured the accessory port would be fine for this. But, I cant figure out the pin-outs. I figured I could just take RX unit and run Receive detect output (CN4 #1) to the TX unit External PTT input (CN4 #7). Plan was to use CN4#1 to activate the PTT and just route audio out from RX to the mic in on TX. But that didn't work...anyone got any ideas? I think I'm having issues because one is an active hi, and the other is active low? I'll try to attach any information needed, .pdf, pics, anything anyone needs. The pic shared is the PCT-19 accessory pin-out. CN1 is used for a separate control unit (I believe GPS), so ignore it. CN3 is horn alert, CN7 is PA..so disregard those too. CN4 and CN8 where the logical ports to use IMO.