C.b.radio-power won't come on.(red & black wire show short!)
This unit has been probably unhooked from coax& keyed-up,or hooked up to battery wrong.(pos.&neg. switched). Red & black wires show continuity. Can you point me in the right direction to find the "short"? Thanks, firstname.lastname@example.org
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Re: c.b.radio-power won't come on.(red & black wire show...
The fault is probably at either end. Yes, it could have been reversed, but most radios are easily protected against this.
If you are getting no lights or anything when keying mic, then there may be an inline fuse along the cable. As you are getting continuity, open the case up, and look for any evidence of heat at the components nearest the power supply - particularly the protection diodes - Black cylinrical components with a silver band.
You really need a meter or scope to go in much further, and check supply voltages between components and -ve, and downloading a copy of the circuit diagram will help this.
The other main fault is usually the output power transistor - which needs a sink for all the power getting thrown at it. If you remove the antenna, it can quickly overheat and fail.
Both components can be checked in-situ for voltage (or not) but the output can only be tested with a scope.
Of course - the "on" light could have blown, so may be functioning without indications, - but I doubt it.
Also check Mic outputs on the plug to make sure that is working. Some units won't function if this is disconnected.
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If you do not have a power antenna you will not hook anything to the blue wire, if you have an amp you can use the blue wire for a remote turn on for the amp, otherwise leave it unhooked and tape the end so as not to cause a short. The yellow wire should be your constant power and the red wire should be your key on power (or vise versa) Not sure what radio you have, but you should be able to google your model number and get a diagram for it. You will hook either the red or the yellow to constant power to save your station and clock settings, and the other hook to a keyed power source so the radio will work when you turn the key to acc or on positions.
Could be grounding out at the starter (bad starter solenoid) Unhook the POS. (large red wire) at the starter and try turning key, see if it blows again. If not, replace starter. I assume you have the battery polarity hooked up correctly? (Red cable to POS on battery, black cable to NEG) Other than that, I would keep looking for a dead short somewhere. Mike
How did you disconnect it?? Antenna wire?? Power supply?? Microphone?? May be that you have a short in your coax in back of radio. Try taking it loose and screw it back in. Try new coax. Turn up Mic gain knob or change microphone. Make sure power wires are connected RED to RED(+) and Black to Black(-). Try grounding radio to metal ; if inside house ground to metal water pipes, filing cabinet, breaker box or meter box or 8 foot rod into earth. Measure SWR it should read 1.1 to 1.5. Measure power supply with Voltmeter it should be 12 to 15 volts. Check antenna plug in back of radio is my guess or microphone itself.
The motor noise comes through power wires and antenna pickup. Get an old ferrite bar out of an old junk AM radio. That black bar with wire wound on it inside AM/FM radios. Tape it to your Antenna coax or try to add 2 of them. Just tape them to the coax at about 6" inches from your radio. Try to add a power wire filter to the RED(+) 12 volt wire and Black wire(-) to your radio. A power filter is just a Ferrite bead or small bar with about 10 wounds of wire and a 470uf capacitor from (+) to ground(black -). Make sure polarity on capacitor is wired (+)(-) that way too. Radio Shack has a "Power" line noise filter kit, that hooks up under your dash. Ask Radio Shack personnel about this they will help you locate a "noise filter" for noisy alternators.Its simple, also, your radio is doing a fine job if it picks up that sensitive through the antenna. That just shows you your antenna is doing a good job. I had a problem like that --I only talked on my CB with the ignition turned off though, it made since to park and talk.
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.
Assuming the engine has not siezed, there is a short in the starter circuit. Probably the starter/solenoid, but you can verify. Disconnect the negative battery terminal, then the big red wire from the starter solenoid. Wrap the wire terminal tom prevent shorting, reconnect the battery terminal and try again. If nothing happens this time, replace the starter/solenoid. If short is still present with starter unhooked, trace wire back from starter to find short. Let me know if you have more questions.
Sounds like you have either a short in your speaker wire somewhere, wires touching in the back of the unit or a short inside the stereo itself... Try pulling the radio out and unhooking all of your speakers...Turn unit back on after all speakers are disconected...If unit still shows protect, then radio is bad...If it doesnt, power off and hook up speakers one by one and power it back on till it shows protect again....When it does, the last speaker wire you hooked up has either a crossed wire or the speaker is bad...
You will need to connect your speaker outputs from the head unit to the high power inputs on the amplifier. If the amp only has low power inputs(rca jacks) then you will need to get a device that lowers the output signal from the radio so the amp can be connected. The red wire will go to the switched power. The yellow will go to constant power. Black goes to ground. Now the blue wire is the signal the amp gets from the stereo to turn on. Your stock stereo will probably not have this ability so you will have to hook that wire to the switched power. Your amp will come on whenever the key is on...even if the stereo is off. If your stock stereo has a wire that sends out a power signal when it is turned on you could try that for the blue wire. Just make sure you have the negative battery cable on the car disconnected so you don't short out your vehicle's electrical system while installing the amp.
there is a wire on the back of your radio that is red and it has to be hoocked up along with the yellow and the black, you have to hook that red wire up to a power source as well that is the wire that turns the radio off and on with your key.