I don't use my CB very much and just noticed this over the 4th of July weekend. Whenever I transmit on the CB, the TX indicator goes on for a few seconds and then goes off. I thought it might be the PTT switch so I held it down harder, with no change. It did this most of the day when I tried to use it. I thought it might be a dirty contact switch, but wanted to check this board before I went any further. Is there any sort of CB “shut down” if certain conditions aren't right? I haven't taken the switch apart to clean it yet. I will check the SWR this weekend; if the SWR is too high will the CB TX shut down to prevent damage? I also noticed that the previous owner used the antenna ground to ground the taillight modulator. I’m not sure this is right and plan to relocate the ground. Any thoughts on this?? Thanks in advance for your help and recommendations.