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
Re: trying to hook up a cobra 29 but keep blowing inline...
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.
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
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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 firstname.lastname@example.org. "Original Radio Man" Ed
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.
If you were trying to transmit without the ant. then your assumption about the demise of your radio is correct.If you hooked it up using an inline fuse ,then just change the fuse. If you hooked up without a fuse, then no, you can not fix it. Please rate this answer.
It,s the mounting the screws are touching something in the radio when bracketed and yes you probably blew the power diode in the radio, it can be fixed pretty easily. Try a fuse on the ground and the hot next time.
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.