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Since the radio cannot transmit on Weather bands, there is no need for the radio to detect if it is transmitting when receiving weather.
In CB mode (on CB channels) the radio will mute when transmitting. So... a guess is that it is muting, or transmitting all the time in CB mode. Check for a mic problem by removing the Mic from the radio ... if it receives CB with no mic connected, then there is an issue with the mic. Otherwise, unless the unit is in PA mode (public address mode) it is likely something internal and beyond the scope of this service.
You didn't include the make / model CB you have, so I can only offer general suggestions. If these do not work, please provided the missing info.
Start out by locating and setting the the Volume to a position between 1/4 and 1/2 way clockwise, the Squelch to fully counter-clockwise and the "RF Gain" to fully clockwise to "MAX".
Check the position of the "PA / CB" switch and set to CB. When set to PA, both receive and transmit audio is sent directly to an outdoor speaker (instead of through the transmitter and antenna for reception by other radios). The PA speaker is usually connected to a jack at the rear of the radio. When the PA / CB switch is selected, the internal speaker is silenced even if there is no PA speaker connected.
At this point, you should hear static or voices (with an antenna connected). Do not attempt to transmit without a properly tuned antenna connected. If no sound is heard, there's something else wrong.
ant. light should only come on if you have a high vswr a bad thing did you check that cb/pa switch is set to cb check your swr this is not a good place to mount ant. as it is close to metal of back of cab
If the meter shows that it's receiving something, the microphone may be the problem. Another possibility is the speaker & plugging an external speaker in would confirm this. Aslo make sure the squelch control is turned all the way to the left (counter-clockwise) & the RF gain is turned to the right (clockwise).