Question about Cobra 29 WX NW ST 40-Channels Base CB Radio

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Blows fuse.s when i hook up the coax

This radio workes in the house. But when I try to hook it up in the truck. it blows the fuse every time.

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The polarity is reversed. The red power lead must go to +, the black to -. Most trucks are - ground but yours may be the opposite.

Posted on Sep 05, 2008

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What all do i need to hook up my realistic TRC-11 CB TRANSCEIVER. WIRES,CABLES,BATTERY etc.


You'll need to decide what style of antenna to use first. Once the antenna is mounted and the coax is run from the radio location to the antenna. Use a SWR meter to tune the antenna to the radio. Use ONLY 50 ohm coax not the coax used for cable TV. If you hear spark plug noise in the radio, then install a choke in series with the power wire. It's best to locate a wire in the fuse box that is only powered when the ignition switch is on or in the accessory position so the battery wont run down if you forget to turn off the radio.

Jan 26, 2015 | CB Radios

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I have a stryker 955 radio.I took my radio out while it was being serviced and I put it back in but it keeps blowing fuses even if I hook it to another vehicle.I have a old 29 and that works in the...


you could be hooking it up backwards and the fuse is blowing because the reverse polarity diode is burnt.replace it,if it still blows it could be your final.

May 28, 2014 | CB Radios

1 Answer

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...


# 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.

Aug 01, 2013 | CB Radios

1 Answer

When i I plug in my coax I get 9 pound plus of static could this be down to bad coax and what would b the best replacement.


first of all,your radio should not even be on when you plug in your coax.second , what time of day is it? Third ,it could be bad coax. the coax you need should be 95% shielded or better and the dielectric should be and the plastic outer cover marked with type " IIA" this coax has a life time of 20 years. It is the best you can get.Is your radio a mobil or a base? A base could be picking up flouresent light energy and your car radio could also .If your car radio is hooked up to a cigarette lighter plug you can pick up extra noise that way.Try going directly to the fuse panel. It could be just a minor adjustment to the RF gain section or the Squelch section.You will need a tech.

Sep 24, 2012 | CB Radios

1 Answer

Hooked up cb, blows fuse when the mic is keyed


when mic is pressed transmitter is engaged. First is the Fuse the proper fuse? Could be an antenna-coax problem. Get a dummy load and hook up to your CB and try it again. If it doesn't blow the fuse, the problem is indeed in your coax antenna system. another way to test your antenna coax is to disconnect it from the radio, take a multimeter, set it to ohms 200 ohm scale, put one lead on the center pin of the coax and the other on the outside of the connector on the coax.if it shows anything at all, you have a short and that will not work. It needs to not read anything. To be sure the antenna system is ok other than swr you can also check the coax an antenna for continuity. one lead of meter on the coax center pin then other on the antenna. should get a reading, a low value. again on the outside of the coax at the connector and at the antenna side on the outside of the coax connector. should be a low reading. but you cannot have a reading from the center of the coax to the outside of the coax. disconnect the coax at the antenna and measure from center to outside at the coax if the previous reading showed a value.If you see a value on the meter, any value, your coax has a short. not good. most likely at the coax connector. redo the connector. It is possible that the coax got compromised somehow and got smashed to the point the outside coax meets the inside and touches.
Now the other possibily your fuse blows, kis because the final output transistor is bad. So if you hook up a dummy load to your radio and the fuse still blows, then the final transistor is bad. This is probably due to a bad coax-antenna system. So before you replace any parts check the coax-antenna system first or you will have the same problem and burn out another transistor in the final. If none of this helps then just get another radio or have a god buddy look at it that knows about radios. Trade him another radio or something to fix it.

Feb 08, 2011 | CB Radios

3 Answers

I have a uniden pc68ltw cb radio and it keeps blowing the 2amp in line fuse i tried a 5amp but still blows the fuse.i hooked it into another truck to test it but still blew the fuse. something wrong with...


Hello,

have you been using the uniden pc68ltw cb radio without the fuse blowing before?

If the uniden pc68ltw cb radio has not been blowing fuse before, then might be a problem from the radio. This problem should be a power related problem.

The fuse blowing means there is excess of current. So while your trying to refuse, thicken the wire.

Best regards.


Feb 23, 2010 | Uniden CB Radios

3 Answers

How do i install a cb radio on a pick up truck


You will need a CB radio antenna, The CB radio and mounting hardware as well as the power wire.

Choose a place to mount the radio. Mount it. Run the power wires from the radio to the fuse box. Put red wire in with the fuse that is hooked to switched 12 volt. Ground the black wire to any metal of the vehicle.

Next find a place to mount the antenna. If you use a mag mount, the roof of the cab is a best bet. Run the wire into the vehicle, it can go through the door, just make sure its not going to get pinched.

Hook the coax from the antenna to the radio

Now you have to tune the antenna. this is important because if you don't you you will blow the transmit final transistor out in the radio.

This link will take you to an article that will explain how to tune your antenna.

Nov 04, 2009 | Cobra 25 LTD 40-Channels Base CB Radio

1 Answer

Uniden PC66a CB blows fuses upon installation


yes the problem is a diode on the input of the rig. this is black with a silver band at one end it will need replacing as it has shorted out.

Aug 05, 2009 | CB Radios

1 Answer

Blowing fuse


Your polarity protection diode has been blown. If you tried hooking up your CB and accidentally pushed the plug in backwards. Inside the radio, there are 2 big black diodes near the transformers, D8 and D23. Replace these with the same or bigger. You can the burnt one out and the radio will work, but if you hook it up wrong again, it will fry the radio.

May 02, 2009 | Cobra 29 WX NW ST 40-Channels Base CB...

1 Answer

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


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

Feb 22, 2009 | Cobra 29 LTD CB Radio

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