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I have a 1989 cobra 29 Ltd classic cb. It got water spilt on it sitting on my tabble so I took the covers off and took a heat gun to it and dried it. I also disconnected the internal speaker and left it off. N I didn't wanna wire it to my pick up to make sure it worked. But I had a messed up extension cord so i wired it to my cb. When I went to plug it in it sparked at the outlet and blow the fuse on cb power cord so i put a new one in and wired a cigeret lighter plug on it and pluged it in my truck. Wouldn't turn on. It blew both fusses on the plug and wire. I changed the wiring with one that has a different type of fuse n still just blowing fuses. How do I fix it

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# 1 you should never dry out a radio with a heat gun.#2 the reverse polarity diode is what is blowing out. take that wire you fixed and toss it.go to Rad Shak or a truck stop and buy a power cord with a lighter plug attached. .Then have someone you can trust replace d23. hook up your coax then your cord turn it on and you are good to go.

Posted on Oct 28, 2013

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SOURCE: I need Wire diagram for Cobra 29 LTD Classic CB

http://xbones_antennas.tripod.com/id21.html

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SOURCE: 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.

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SOURCE: What's your problem? my copra 148gtl always

More than likely the RF power transitor/module is short circuit. The usual cause is a faulty aerial.

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One Wire
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SOURCE: Brand new Midland 5001z 40 channel cb blows fuses its turned on

Where did you buy the radio at? Can you return it to the store? If you purchased it at a big box store, like Walmart, they will take it back without a receipt on an exchange.

More than likely the radio was wired backwards by someone, which blew the protection diode, and then was returned to the store and put back on the shelf.

If it is just a blown protection diode, it is only a $10 fix at most any cb radio shop.


If I can help anymore, please let me know.

Dean Pitts
Rollin CBs
dean@rollincb.com

Posted on Mar 06, 2012

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