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Blowing fuses I keep on blowing fuses in my cb whenever i key it up. If i talk for a short time its ok. If I hold it any longer then 5 seconds it blows.

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Sound like: 1. Are you using the correct fuse rating?? 2. Are you supplying the correct voltage?? 3. You probably have final amp problems.. get an expert.

Posted on Feb 11, 2008

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I have a connex 4300hp . I have power until i key up ,then it blows the fuse . What size fuse does this require ?


There are many reasons for it to blow a fuse .Putting one in that is higher in amps won't help ,all it will do is prolong the reason it is blowing fuses. One reason could be IC 5 thats blowing them.

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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.
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Just installed.as soon as i key mike inline fuse blows


check the swr's probably are high if it blows fuse. those should have a 5 amp fuse.

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I have a problem with my uniden cb with nitro 300a amp. The amp keeps blowing fuses immediately when I turn it on and I do not know how to trouble shoot the problem. Any help will be greatly appreciated.


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I have a TRC 458 cb.... it keeps blowing fuses


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My magnum when i key up it blows the fuse,what could it be?


check your aerial for open/short circuit/power wiring to cb in truck/upgrade the fuse by 1 amp/mike wiring (tx/rx) if the cb shop could'nt find anything wrong then the faults in the truck/aerial/power? or the cb shops not up to much! you could have a faulty output transistor in the cb if all else fails?

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does it do it with the radios disconnected? if so need to check the wireing. in the truck for shorted against something. if only with the cb hooked up blowing fuse then need the cb checked out.

Feb 28, 2009 | Radio Communications

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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.


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2 Answers

Fuse blows when I key the microphone. Why does this happen?


i am pretty sure something came loose or a connection went bad, now something is shorting, possibly to the chassis. if you think you know how to open it up and work on it than do it. Or take it to a tech and have them look at it. it should be a real quick, real simple fix.

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