Size fuse for cobra 25 ltd wx - Cobra 25 LTD 40-Channels Base CB Radio

It sounds like the switch is bad. I'd have Cobra warranty it for you.

If you have not bought it yet some dealers may have them already set up.Cobra is a popular radio so before you buy ask. you could just match it up to a cobra 25 mic though.

Just about all fc 347 come with instructions on how to wire it to the radio.

it depends on what radio if you have a cobra 18wx style or maxon's, or a radioshack type the red is constant power 12v, orange is a switched 12v.. IE key like a stereo, and black is ground. if you have a 25 or 29 ltd types or exports they only have 2 wires red 12v and black ground. but you do find some power cords that have all three, and the orange on the 25 / exports are not used.

do you have a spectrum analyzer? A function generator , bird 43 watt meter,multimeter etc. ? If you have all these then go to www.cbtricks.com and get the information you need .

sounds like your wx receiver is being activated by a bad switch replace the switch to disable the wx when you dont want it to come thru

to be sure that u dont burn yr radio try to check yr swr with an external meter to be mounted between the radio and the antenna and check if it works! good luck.
rgds stefano

You most likely blew a Diode that is back near the power plug.

It is easy to fix the diode but if you continued to apply power you may have damaged other parts including the audio chip.

the mics on these cobras have a receive wire in them so the transmit will still work even if the receive wire is broken,if this wire is broken the unit will not make any sound...........remove the plug from the radio end of the mic and check the connections on the 5 pin connector.....(could be a cold solder or broken wire) or try a new mic or one that is proven work on another radio
hope this helps.................good luck!