A home base power supply is required to convert the standard 240 volts from a wall socket to 12 volts to power any CB radio up. If you are using your CB radio in your car, there is no need for a separate power supply box to convert the voltages because the car battery provides the correct amount of 12 volts. If your CB radio is not getting no power from its power supply, it will not turn on. There can be many different reasons on why your CB radio is not getting any power, it could be just a simple as replacing a fuse or the power supply can become bad. To help your troubleshoot this particular problem, go through the following steps provided below to help fix your CB radio.
1) Is your CB radio getting 12 volts? Use a multimeter to check the voltage that is coming from its power source. This is vital to find out because if it's not getting 12 volts from the power source, you can tell if the power supply or the CB radio is the problem. So setup the multimeter to read in voltage mode, attach the negative probe to the negative wire and the positive probe onto the positive wire connecting into the CB radio. Switch on your power supply, the screen of the multimeter should read around 12 volts. If it's displaying 0 volts, at this point you have identified that the CB radio is not getting no power from the power source and the CB radio is not faulty.
2) Check for any bad or wrong connections. If the wires from the CB radio to the power supply are not connected properly or are short circuiting because the wires are touching each other, both can be possible causes to your CB radio getting no power. Run down the wires from the CB radio to the power supply and look out for any wires that are not taped up and touching each other. Also a CB radio has two wires that are required to be connected to a power source in order to make it function. If the wires are connected with the wrong polarity, so the positive wire is connected to negative and negative wire connected to positive, it will not power on at all. So ensure that they are connected the right way!
3) Check if the fuse is burnt out. A CB radio uses a fuse to protect itself from getting damaged during a power surge or a short circuit. The role of the fuse is to break when the current becomes too much for it to handle. Your CB radio will have its own glass fuse inside a fuse holder, which is found on the positive wire at the back of the rig. The way to identify if the fuse is blown out is by looking in the middle of the fuse, if the small wire looks burnt or has snapped, it's the problem causer and needs replacing. Make sure you use the correct glass fuse of the same amps because if the amount of amps the replacement fuse can handle is too less or too much, it won't protect your CB radio from getting damaged next time something goes wrong.
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