Question about Cobra 29 LTD CB Radio

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When i plug my 29 plug in, into the cb it auotmatically blows the fuse whether the cb is on or off. do you have any suggestions as to what might be causing this to happen

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Yes I know the problem!! At one point the radio was pluged in backwards the positive prong touched the negative and vise versa and caused the Reverse Polairty Diode to pop inside the radio!! The only wat to fix this is ti have the radio taken to a Radio Tech and have the old bad part removed and a new good part put in!! The price of this fix varies from Tech. to Tech. depending on the C.B. shop!! e are a full line C.B. shop and we also do repairs. A repair like this some times will go around an average of 35.00. We would charge around 15.00 to fix it plus S+H if any one came to us for this problem!! oplease feel free to E-mail us with any other questions that you may have at" bigdscbshop@hughes.net We hope this helps

Posted on Sep 23, 2009

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Actually, the original diode is a 1N4004, but 1N4007 will work fine . It is in a tight spot just under where the power enters the radio, behind a large 1000uf cap . Use solder wick to remove the old diode . Make certain that the new diode is placed so that the stripe / band is in the same direction as original, or as indicated on the board . Solder her in, and your on the air ! J

Posted on Nov 28, 2009

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Just remove the old diode and replace with a 1N4007. Cost about $0.05.

Posted on Nov 12, 2009

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1 Answer

I have a 1989 cobra 29 Ltd classic cb. It got water spilt on it sitting on my tabble so I took the covers off and took a heat gun to it and dried it. I also disconnected the internal speaker and left it...


# 1 you should never dry out a radio with a heat gun.#2 the reverse polarity diode is what is blowing out. take that wire you fixed and toss it.go to Rad Shak or a truck stop and buy a power cord with a lighter plug attached. .Then have someone you can trust replace d23. hook up your coax then your cord turn it on and you are good to go.

Aug 01, 2013 | Radio Communications

2 Answers

I have a 29 ltd with no mods that i know of .i installed it into my 2006 nissan titan and when i plug my power cord into the unit it instantly blows the inline fuse. i have a 3 amp fuse in it . do you...


  • Well it could be. Did the CB work before putting it into your truck? If the fuse is blowing you have a direct short. You might pull them two little screws on the tip of the cord and inspect the wires and tips of the cord. Make sure everything looks good there. Make sure the cord is hooked up properly as well.

  • Let me know what you find out.
  • Hope this helps.

Nov 19, 2011 | Cobra 29 LTD CB Radio

1 Answer

What would cause my cobra 29 to blow fuses when u turn on the power


You have a bad diode near back. Probably the black fat one with a stripe. Its located near power leads and audio transformer in one corner. Change all Black Diodes with (White) stripes in back. You must of crosswired it blowing the diode.

Mar 31, 2011 | Cobra 29 LTD CB Radio

1 Answer

Blows fuse when connected to power source


reverse polarity diode is burnt or blown. change it.

Jul 25, 2010 | Cobra 29 LTD CB Radio

1 Answer

It blows fuses when u plug the power cord up


The radio was probably wired backwards at some point. There is a reverse polarity diode inside that must be replaced to fix this. If you have continued replacing fuses and plugging it back in, there may be further damage such as finals or audio amplifier chip as well. you will need to take the radio to a qualified repairman for service. If it is simply the reverse polarity diode, your bill should not be more than an hour's labor charge.

Feb 02, 2010 | Cobra 29 LTD CB Radio

1 Answer

Im a trucker so when i plug my power wire the fuse blow why


You probably plug it in backwards at some point. When you do that you blow the polarity protection diodes. They are so you do not blow the radio.

Get a N14003 diode from radio shack.

Open the radio's bottom cover where the speaker is. Watch the speaker wires.

Near the back right of the board where the power cord plugs in left of the transformer, look for D23. Its the same diode as the one you bought from radio shack. It is most likely burnt.

Remove that one and replace with a new one.

The radio should work fine now. Be careful when plugging that thing in.

Oct 11, 2009 | Cobra 29 LTD CB Radio

1 Answer

Blowing fuses


If the red wire scraped against the firewall on the way to battery due to sharp edges on the metal it will just short out. It has a dead short somewhere in the wiring or in the CB itself thats why it is just popping fuses as soon as they are installed.

Jun 04, 2009 | Cobra 29 LTD CB Radio

1 Answer

Blowing fuses with wiring CB to battery


Is the wire going to the battery touching chasis ground at all? Accidentally pinched it, cut wire etc? If not the the power supply may be fried.

Jun 04, 2009 | Cobra 29 LTD CB Radio

1 Answer

Blowing fuse


Your polarity protection diode has been blown. If you tried hooking up your CB and accidentally pushed the plug in backwards. Inside the radio, there are 2 big black diodes near the transformers, D8 and D23. Replace these with the same or bigger. You can the burnt one out and the radio will work, but if you hook it up wrong again, it will fry the radio.

May 02, 2009 | Cobra 29 WX NW ST 40-Channels Base CB...

1 Answer

B;owing fuses, wont power up, just smokes


Hi,

Try checking the reverse protection diode. This diode would normally be connected right after the power connector and would be the biggest diode inside. One way to verify if this is defective and causing the fuse to blow is even with the power switch at the OFF position, the fuse will still blow.

If on the other hand, the reverse protection diode is good and fuse will not blow when power switch is at OFF, then the short/defective component is inside. There would only be two (2) major components that can cause the fuse to blow with the power switch to ON, the final transistor and/or the audio IC.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Jun 06, 2008 | Cobra 29 LTD CB Radio

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