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Assuming the antenna is mounted and grounded correctly,when you try to transmit/talk does your meter needle move to the right with your voice,if it doesn't make sure meter knob is set to receive/transmit or mod[modulate] does it move to right now,if not make sure the mic gain knob is turned up or if it is a power mic,is it turned up&have a fresh battery.The antenna light could mean high swr readings which you will have to adjust by tuning the antenna with the radio meter or external meter,you can search swr adjustment on your computer if unfamiliar..some antenna warning lights are factory set too sensitive but most times are telling you there is a problem.If all is set&tuned properly and you still can't get a local signal to respond, your radios transmit finals could be blown,which you'll need a qualified radio tech to determine..Good luck& 73's
It is odd to see them both quit just like that. Were you messing with the buttons on one of them when it just quit? Did you happen to change one of the privacy channels on a main channel? The privacy channels isolate a main channel so you can talk on a channel without everyone with a radio hearing you. Make sure the channels on both radios are on only the channels and that no CTCSS or DCS code accidentally got added onto a channel. You should be able to tell by just looking at the screen and you will see the channel you are on and will also indicate a CTCSS or DCS code. Should you see either of them then remove them and retry the radio on a plain channel only.
Should this fail the you have got some major internal malfunction that happened to happen at the same time and it is time to invest in a new set of radios.
Could be your mic does not work. Usually CBs has paging capability, set its paging system on(check speaker set up). If your mic is OK, I suspect you don't have transmission at all. To check without having special instruments, have a PL259 connector and connect a few inches of RG8 or RG58 and connect a 12V lamp(cars signal light bulb can do) at the other end, then press your PTT button and bulb must glow and go brighter when you talk. If not glowing at all maybe your final amp is busted, have it checked by the expert. Good Luck
Try checking the SWR's on channel 1, 20, and 40. The SWR's will change from the low channels to the mid channels to the high channels. The key is to make sure that the SWR's are around 1 or less at all three points.
If the light goes out when checking one of them, then the problem is most likely the SWR's. If the light stays on when checking these channels, the issue might still be the SWR's but I would look at the grounding on the antennas. When holding the talk button on the mic and switching from calibrate to swr, can give a false reading. This is due to the calibrate circuit remaining open until you release the talk button.
Take the SWR reading by releasing the Talk button on the mic after calibrating then pressing the talk button again after switching back to SWR. This will be the most accurate reading.
From everything you described, I would be looking for a grounding problem with the antennas or coax, possibly even a rub though on the coax somewhere in the dash.
Turn the volume up about 1/3, the squelch off or fully counterclockwise. You should now hear static or talking,if not something is wrong with the radio. As a last resort change to channel 19 and see if it is dead as well. None of this is valid unless you have a proper antenna connection. When you are receiving then adjust the volume to a comfortable level and turn the squelch up, clockwise, until it just mutes when no one is talking. The higher the squelch the stronger the signal has to be to be heard. Good Luck, Gilshultz