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Cobra mic rewire

Coondog27

Member
Sep 29, 2016
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Hello all. I have a cobra high gear power mic. It uses the 9v battery and is a 4 pin plug. The wore colours are red, blue, black, yellow, white, bare. I found a diagram on cb tricks that kind of shows which wires go where, but when I resoilder the wires to the plug (following diagram and translating them to the radio plug, not the mic end) the radio is always keyed. When I key the mic, yeh speaker is very faint. No biggie, I switch the red and blue wires (TX/RX) then the speaker is faint, but doesn't transmission.
 

White/yellow/bare hooked to number 4. Black to 2, red to 3 blue to 1. That's the way it will make the transmission light turn red and move the needle, but doesn't transmit to another radio. Speaker very faint also.
 
are you looking at the diagram in the manual you posted?

because you are wiring it opposite of what the diagram says.

look closely at your mic plug (the black plastic thing with the solder pins on it) and you should see some very small numbers next to the pins/ holes. some have them on the front, some have them on the back (solder side) and some have both sides labeled.

you should not be using the yellow wire.

wire the white wire and the bare copper wire to pin 1.
wire the red wire to pin 2.
wire the black wire to pin 3.
wire the blue wire to pin 4.

4pin.jpg


an easy way to determine which wires do what on an unknown mic is to use your multimeter set to continuity.
strip back an inch of the cord and then strip off about 1/8" off of each wire in the cord.

there will always be one that is bare stranded/ braided copper wire, and it will always be wrapped around one of the other wires.
the bare wire is your ground/ shield.
the wire that it's wrapped around is the audio wire.

now take your multimeter and put one lead on the ground wire, and the other lead to one of the wires you haven't labeled yet. one of them will show continuity.
this is your receive wire.
now press the mic button and do the same thing again. the wire that shows continuity with the mic button pressed is your transmit wire.

yes, there are always other considerations, in your case, the white wire is also a ground and needs to be wired to the ground pin on the mic plug.
my method is just a way to get started figuring it all out.

hope this helps.
LC
 
It does thank you. I had it wires up via the diagrams but it would make the speaker buzz loud when keyed up. Then when I unkeyed, it would still buzz, but a little faint.
 
yes, just cut it back so it can't short against any other wires.

i feel like one of the problems you are having is whether or not you are looking at the front or back of the mic plug, which is why posted the pic of one with the numbers showing.
LC
 

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