Question about Cobra 25 LTD 40-Channels Base CB Radio

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Cobra 25 ltd wx wont power up

Accidentally switched pos and neg on power cord now radio wont power up ,opened it up and when i plugged it in seeing smoke from capacitor c170 1000uf 25v pwr ,should i try to replace this ?any other things to check?

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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.

Posted on Jan 02, 2009

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How to check wiring inside a cobra 25 classic to determine if its made propperly


Yes, if you have a meter check resistance (like reading a fuse) with the radio off and power cord removed.

Only two of the three pins (look at power cord to see only two have metal in them) are used.

With power switch on front in off position there should be no reading across the + to - pins on the back of the radio.

If a short there the protect diode is shorted--likely first time it got hooked up backwards--easy to do.

Follow in this case the + pin on back just inside the radio and it goes directly to a diode. cut the diode if a short there and read again at the plug--if short gone replace the diode--radio will work without it but you will have no protection in that case.

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Jun 02, 2012 | Cobra 29 LTD CB Radio

1 Answer

Size fuse for cobra 25 ltd wx


hi please insert a 6amp fuse on the dc positive line it will work fine with this

Nov 04, 2011 | Cobra 25 LTD 40-Channels Base CB Radio

1 Answer

Need wiring diagram for plug for 12vdc cobra 29 nw ltd. i have no cord. need to know which pin is pos &which is ground


Hello awchris.
Welcome to FixYa.
My name is John, and I will be assisting you with your issue today.
With your unit face-up, you will have three (3) pins in the back, the
positive (+) is the pin on the end closest to the next pin. the negative (-)
pin is the one that,s further away from the others. You can purchase this
plug at any CB shack or RADIO SHACK for a few bucks.
I hope this was helpful to you. Your Comments and Testimony,s are always
welcomed here and thanks for choosing FixYa today and in the future.

Feb 23, 2011 | Cobra 29 WX NW ST 40-Channels Base CB...

1 Answer

I don't know how I copied and pasted so much sorry about that. But my question is I have orange and red wires with fuses and black wire without do I hook both red and orange to hot and black to ground?


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.

Feb 09, 2011 | Cobra 25 WX-NW-ST 40-Channels Base CB...

1 Answer

I wish to tune and peak a cobra 25 ltd wx. please tell me what pots to turn. I have all of the necessary meters.


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 .

Sep 06, 2010 | Cobra 25 WX-NW-ST 40-Channels Base CB...

1 Answer

Weather bleads Over on 21 LTD WX CLASSIC(*HELP*)


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

Jun 10, 2009 | Cobra 29 WX NW ST 40-Channels Base CB...

1 Answer

CB keeps blowing fuses


There are a few common reasons the fuse keeps blowing:

1. The transmitter final transistor is bad, it usually is directly connected to the 12v source and not switched by the power switch.
2. The power wires were accidentally reversed I.E. positive to ground, neg to 12v. There is a protection diode on the circuit board that did its job and is now shorted. it will keep blowing fuses until its replaced.


Dec 30, 2008 | Cobra 18 WX ST 40-Channels Base CB Radio

1 Answer

Cobra 25 ltd wx classic


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!

Dec 18, 2008 | Cobra 25 LTD 40-Channels Base CB Radio

3 Answers

Cobra 25 LTD


Russ, go to RadioShack, if they don't have one in stock, they can order one. Or, you can Buy one on EBAY.

Jul 02, 2008 | Cobra 29 LTD CB Radio

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