Question about Cobra 29 LTD CB Radio

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It blows fuses when u plug the power cord up - Cobra 29 LTD CB Radio

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  • Jim Anderson
    Jim Anderson May 11, 2010

    Can you tell me if the radio is used or new? Has it been uh...modified in any way? -Jeeem-

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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.

Posted on Feb 12, 2010

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Posted on Jan 02, 2017

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Without seeing the ports of the car and the plug of your charger, it would be difficult to diagnose with any certainty. I do have a suggestion however. Your note suggests that other devices do not cause the fuse to blow when they are used - it is only the charger for the phone. Since the charger works in other cars, it is probably not an overload condition due to a defective charger, but more likely a mismatched set of contacts between the plug and power port in your car when the two are mated. Some cars have slightly different sized power ports that can be either too tight or too loose for some plugs. Too tight ports could be causing parts internal to the charger's plug or car's power port to short together and blow the fuse.

We can get around this be using a different plug. The easiest way is to find a cord set that will plug into your car's power port and provides a simple extension for 1, 2 or 3 outlets. These can be found in auto parts stores and the automotive departments of stores like K-Mart, Sears, etc. Some examples look like these:


8_27_2012_9_46_15_pm.jpg

8_27_2012_9_46_33_pm.jpg
Insert the plug into the power port - and check that the fuse does not blow by checking the fuse - not by plugging something into the the outlet on the cord. If the fuse remains good, then it is safe to assume that the problem with your charger and the car's power port has been eliminated, and the car's power is available at each of the outlets of the new cord.

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You could achieve the same results by changing the charger plug under the right conditions - but many chargers now a days have circuitry inside them that change the car's 12 volts to something different. If you can find the voltage out of the charger and are able to match it with another - it must be the same voltage, polarity, current and phone power connector of course - it should work, too. You must be absolutely sure of the power requirements and your rewiring - if not, stick with the addition of a cord described above.

I hope this helps & good luck!

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  • Let me know what you find out.
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yes it could be a fuse but moust of the time
the fuse is blowing because power suger/or bad flyback/hozoutput/or power supply whent bad. unplug the tv .take off the back and look for the fuse you see the power cord it by the powercord if the fuse is black it a hard blow.
if you can see thur it .it a sofe blow you can try to chang it.6.1amp fuse125v or it could be 250v fuse6.1amp and if the fuse blow agon you have a short powersupply

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