Question about Cobra 29 LTD CB Radio

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Trying to hook up a cobra 29 but keep blowing inline fuse

I'm trying to hook up my spare radio in a different truck while mine is in the shop. The radio is the one that was in my Kenworth when I bought it and it worked fine. I took it out to put in a hotter radio and have kept this for a spare. I am now trying to hook it up in a 2004 Freightliner and the fuse blows out each time I try to plug in the power cord. I'm sure I have the polarity correct

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I had the same problem with a 25 that was just disconnected for replacement. I found a shorted diode right where the power cord came in. I also didn't like the way the electrolytic capacitor right next to it was charging so I changed it also.
Problem solved.
I am sure the 29 will have a similar setup. I you want I will look up my schematicof a 29 and tell you the numbers to check.
Of course it is also possible somehow too much voltage was applied to the radio. In which case the previous repairs will almost surely be needed.
I hope this helped, Good luck
tdill49

Posted on Feb 23, 2009

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How do i find and replace the finals in a cobra 29ltd classic


The protection diode (a black, tub looking devise) hooked to the positive power wire near the back of the radio, is most likely your problem. Check to see if any doides are shorted by using a Volt/Ohm Meter by checking for a short. For more imformation or help, email me at wyoed1@aol.com.
"Original Radio Man"
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Usually a 3 amp quick acting 3AG fuse---do not use the generic ones from Radio Shack.

If the radio got hooked up backwards look and test for a dead short across the power leads-----there is a diode just inside where the hot lead goes that will be shorted .

SD TECH

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If you look at the tabs on the switch. You will have what looks like this.

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Have cobra 29 nw ltd keeps blowing fuses inline and in cigarette lighter adapter adapter is 10 amps and inline is no more than 5 amps


This is an easy fix if you are comfortable soldering.

You must have hooked it up backwards. Big problem when using a cigarette lighter adapter. You have to be careful, if you hook a radio up backwards you blow the polarity protection diode.

  • Go to radio shack and buy an N1004 diode.
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  • Look towards the back right of the radio for a black diode D23. it will probably look burnt, but not always.
  • Use a soldering wick to remove the solder holding the diode in.
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That should do it.

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Bub


first check the inline fuse to see if it is still good. If it is'nt, you can tell by the link in the fuse, will be broken and glass will look burnt. I f fuse is good then you can a schematic drawing of your radio and it will show you wher the resistor or diode that is a back up or safty circut for your radio. google cb radio and you will find many useful sites for repair and mods.

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