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CB Microphone Wiring

We created this page to help people understand that not all microphones are wired the same way. For example, just because two different microphones are 4 pin does not mean that they are wired the same, even if they are the same brand! Different manufacturers may wire their microphones differently. Generally, a radio manufacturer will wire their microphones the same so that the microphones are interchangeable between their radios, however, this is not always the case.

For example, Cobra 4 Pin radios are wired 1) Shield 2) Audio 3) Transmit 4) Receive while Midland 4 Pin radios are wired 1) Audio 2) Shield 3) Receive 4) Transmit. There are some radio brands that have the same general wiring (such as Cobra and Uniden) but that is not always the case.

The list below offers some CB microphone wiring information. CB mic wiring can be frustrating enough, but when you can't find the right wiring info, it is just impossible. We will continue to try to get all the information that we can listed on this page.

CB Radio Mic Wiring Diagram

CB Microphone Wiring (Galaxy)

The chart and image above are correct for these models:

(Extra NOTE: The popular Astatic 636L-DX1X is compatible with these)

Galaxy CB Radios

  • DX919
  • DX929
  • DX939
  • DX949
  • DX959
  • DX979
  • DX44V
  • DX55V
  • DX66V
  • DX77V

Cobra CB Radios

  • 19 DX IV
  • 148 GTL
  • 18 WX ST II
  • 19 DX IV Camo
  • 25 LTD
  • 25 LX
  • 25 NW LTD
  • 25 WX NW ST
  • 29 LTD Chrome
  • 29 LTD Classic
  • 29 LTD DE
  • 29 LX
  • 29 LX Camo
  • 29 NW LTD
  • 29 WX NW ST

Uniden CB Radios

  • PC68LTW
  • PC68XL
  • PC78LTW
  • PC78XL
  • PRO505XL
  • PRO510XL
  • PRO520XL

Midland CB Radios

  • 1001LWX
  • 5001
  • 9001Z

Wiring for the C29 LX MAX and the C29LTDBT:

  • 1) Ground
  • 2) Audio
  • 3) Transmit
  • 4) Receive
  • 5) BT Button
  • 6) BT Microphone


Pin-End Views

Cobra 4 Pin Mic Wiring Diagram
Cobra 4 Pin


TX = White, MOD = Red, REC = Blue, Shield/Common = Braid/Black

Midland 4 Pin Microphone Wiring Diagram
Midland 4 Pin
TX = ?, MOD = ?, REC = ?, Shield/Common = ?
Cobra 5 Pin Microphone Wiring Diagram
Cobra 5 Pin


TX = White, MOD = Red, REC = Blue, Shield = Braid, Common = Black


Wiring Color Codes for Astatic 6 Wire Microphones:

  • White - Audio
  • Shield - Ground
  • Blue - Common for Switching
  • Red - Push to Talk (Transmit)
  • Black - Receive
  • Yellow - Receive Ground (not normally used)

NEW information - 6/26/18

CB Microphone Wiring Diagram


Hi, I have a K-PO DMC 110 and need the wiring diagram for a CRT SS6900N, can anyone help.

Thanks in advance.
Good evening.
Hello, I have a HG M84W Noise Cancelling mic, the wood grain. I bought on line was going to put it on my Cobra 29LTD Chrome but it doesn't work. I tried taking it apart and looking online for info, and for some reason this mic is a mystery, not 1 video from anyone on how these mics are wired or how to wire them. It is a 4 pin, the colors of wire are red, white, black, yellow, green. Not any ground wires or shielded. It has a small transformer, ( no markings). Red and black from mic. Don't really have the time or money to take it to a shop is the reason for trying it myself. Any help would be greatly appreciated.
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