Question about Cobra 29 LTD CB Radio

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

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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.

Posted on Apr 01, 2011

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1 Answer

Does my cobra 29 wx nw sound tracker cb radio have internal fuses

If you have reversed power leads you may have blow the protection diode and fuse. Well I am sure the fuse is blown if this is the case you may have been lucky and only popped the fuse if you replace the fuse an it blows also you will know for sure but be sure you don't use a larger fuse. Now we will assume the worst that the diode is blow. Remove the speaker side cover and with a pair of side cutting wire cutters cut D23. If you have trouble finding it its the second component from speaker jack next to a cylinder electrolytic capacitor it is a black component. This will stop your fuse blowing problem that was created when reversing polarity but unless you replace the diode you have disabled your protection if it happens again. It is a good practice to turn on/off switch to off position before connecting power. Take care .....hope this was of help.

Jul 27, 2014 | Cobra 29 WX NW ST 40-Channels Base CB...

1 Answer

My cobra 29 classic wont turn on

polarity protection diode near power input burnt.

Apr 14, 2013 | Cobra 29 LTD CB Radio

1 Answer

Main power was hooked up backwards, now unit won't power up. how much damage is likely?

i gus i hook up the power up and blow some thing it is a black 29 cobra got aney thing to fix it

Feb 06, 2011 | Cobra 29 LTD CB Radio

1 Answer

Cobra 29 ltd classic will not power up

Hi pig pen, my name is John. Welcome to FixYa. Check that the in line fuse is not blowed. Make sure that you are getting power to the unit, and that it is grounded good. Let me know if you need more help from this point,and I will post the solution here. Thanks for choosing FixYa...John

Dec 03, 2010 | Cobra 29 WX NW ST 40-Channels Base CB...

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

2 Answers

I have a Cobra 29 NW LTD Classic I have power going to radio but no power when i turn on knob. i have looked inside for a fuse but can not find one.

did you look for power comming out of your power switch....
dont tell me that you hooked it up backwards. if you did check the imput diodes

Aug 29, 2009 | Cobra 29 LTD CB Radio

1 Answer

I have cobra 29 ltd has power going into radio but wont com on when you turn power knob

remove the outer casing, there is a glass fuse..( 1.5 amp ) has probably blown

Jul 30, 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

2 Answers


check your ground wire and make sure it is getting a good connection because if not you will keep blowing fuses after a while

Jan 06, 2009 | Cobra 29 LTD CB Radio

1 Answer

B;owing fuses, wont power up, just smokes


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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