Question about Connex CX-4300HP CB Radio

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Everytime i plug my radio in it blows the fuse in the power cord...what could be wrong????

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It has a diode in back of radio near power wires. If it got hooked up backwards one time it will blow this diode and fuses from then on. Replace that Black striped diode near transformer inside radio. its in the far right. You have to take radio apart and solder in a new one or get a pro to do it.

Posted on May 24, 2011

  • Russell Mullis Oct 03, 2013

    I have the same problem with my general lee I have replaced both of the R.P. diodes at the power intake so if anyone has any knowledge of repairing this I sure could u se the help

  • Russell Mullis Oct 03, 2013

    I have a general lee



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1 Answer

Keeps blowing a fuse, assume it is bad radio. No fuse will solve it

Something wrong in the power circuit if the cassette cause the fuse to blow everytime. The power circuit should be fixed first then no fuse will be blown

check for short circuit component at the power circuit. Transistor or diode or zener whichever there

May 06, 2015 | MB Quart WR1-CD Nautic Marine...

1 Answer

Midland cb keeps blowing fuses

depending on which model it is there is a reverse polarity diode near the power cord that connects the radio . If it was connected wrong no matter how many fuses you insert it will keep blowing them. You have to change that diode in order to get the radio to work. If you still have the fuse problem then take it to a tech and let him fix it.

Feb 11, 2015 | Midland Radio Communications

1 Answer

I have a cobra ltd 29 chrome edition that is not getting any power when you turn it on

Before you had this problem, did the power cord accidentally get plugged in backwards?

If this is the case and the inline fuse on the power cord blows everytime it is plugged in correctly, then more than likely your protection diode is blown.

This is not typically the end of the world for a cb radio. If all that happened is the diode blown, it is a 10 cent fix if u do it yourself, and a $10 fix if you take it to a cb radio shop.

If you feel comfortable opening up your radio and you want to verify this is the problem, then remove the cover from the bottom of the radio (the one with the speaker holes.

In the back right corner of the radio locate D23. This is the protection diode. Sometimes when it blows, it will actually fall apart, and sometimes it will just crack.

Another test, if you have a multimeter, set it to read resistance. Before doing this test, make sure the power cord is removed from the radio, and then cycle the power potentiometer on and off (this will de-energize all of the capacitors. Now, connect one lead to the positive pin and the other lead the the negative pin of the power socket at the back fo the radio. If the protection diode is blown, you will read a direct short. If the protection diode is still good, you will read over a couple hundres ohms (mine is reading 582.1 ohms right now).

If you find out that the protection diode is bad, and you want to try and tackle the repair yourself, you can email me and I will send you complete instruction guide I created a few years ago for another member.

Dean Pitts
Rollin CBs

Feb 26, 2012 | Cobra 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

Whistler 1730 keeps blowing fuses. no other problems with cigarette lighter plug

Is the lighter socket fuse blowing or the fuse in the unit's power cord? Have you tried another power cord from a Friends radar detector? If it doesn't blow that power cord's fuse, then your power cord is bad. If it does blow the fuse in the other power cord, there could be something wrong with the unit. Contact Whistler at

Jun 15, 2011 | DE-1730 Radar Detector

1 Answer

My fuse blows everytime i plug in my sirius radio to cigarette lighter...why?

is that the only device that is blowing a fuse? if it is the only thing blowing your fuse you may need to replace the charger. check the fuse to make sure it is the correct size ( usually 10 amp). check the power adapter to make sure there are no loose connections or anything in the plug that doesn't belong there. unplug the radio from the adapter and plug the adapter in without the radio see if the fuse blows . if it blows replace the adapter. if it doesn't blow the fuse check the adapter to make sure it is the right one make sure the polarity is correct

May 12, 2010 | Sirius Satellite Radio Receiver

3 Answers

I have a uniden pc68ltw cb radio and it keeps blowing the 2amp in line fuse i tried a 5amp but still blows the fuse.i hooked it into another truck to test it but still blew the fuse. something wrong with...


have you been using the uniden pc68ltw cb radio without the fuse blowing before?

If the uniden pc68ltw cb radio has not been blowing fuse before, then might be a problem from the radio. This problem should be a power related problem.

The fuse blowing means there is excess of current. So while your trying to refuse, thicken the wire.

Best regards.

Feb 23, 2010 | Uniden Radio Communications

1 Answer

Mitsubishi tv vs 60707 fuse keeps blowing everytime i plug it it

1. unplug from the wall
2. cut off the end of the power cord
3. splice the plug from an extension cord
4. tape it up real good
5. try again

Feb 04, 2010 | Mitsubishi VS-60707 60" Rear Projection...

1 Answer

Power outage

this radio takes a 7 amp fuse in the fuse holder if it blows the fuse the most likely the radio has blown the protection diode at the power plug on the positive side this usually happens when the radio is hooked up backwards.

Feb 22, 2009 | Connex 3300 240-Channels Base CB Radio

1 Answer

Gen lee blowing fuses when keying

What size fuse are you using? If you have a different power cord than that which came with the radio, such as one from a regular cb radio like a cobra 29, it will only have a 2.5a to 3a fuse, which will blow everytime you key up, since it is pulling to many amps. You need to have at least a 7.5a to 10a fuse. I use 7.5 amp fuses, because I have a 100 count box, and have no problems. The Stryker radio I have in front of me has a 10a fuse in its power cord from the factory, though the cord on my bench only has a 7.5a and has not blown.

If your radio still blows fuses after this, please let me know. You can message me here or email me at

Dean Pitts
Rollin CBs

Aug 29, 2008 | Connex 3300 240-Channels Base CB Radio

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