Ive been useing my cb for about four weeks and just today the little meter thing on the left hand side stopped working when i speak but works just fine when the signal is coming in. and ppl cant hear when i speak unless they are within three feet, but its still very quiet how do i fix this?

Check C-144, c-149, c-153, c-154 using an ESR meter.

No! everything is working fine, so long as it continue to work fine leave well enough alone.

I can't speak for the engine light issue, but look into stepper motors for your gauges for the oil pressure issue. I just purchased a used '04 Trailblazer EXT and the tachometer stopped working 1 week after driving it off the lot. I did some looking and apparently the Delphi motors that GM used do not hold up. "Check this link for more info...
http://forums.trailvoy.com/showthread.php?t=48886

sounds like the amp got hot and shorted on the bias.. and is keyed up a few watts. to fix you will have to have the amp repaired. new power transistor. to fix. 3174269649 Texas.

The Magnum 257 is a 10-meter Amateur radio, but it can be easily modified to operate on the 11-meter CB radio band. The modification and use of this radio on the CB frequencies is, of course, illegal. To modify one of the newer blue-faced models (this will not work on the original yellow-face models), remove the speaker side cover and look for the CPU board in the front of the radio close to the mic connector. This board has four sets of pins and a jumper that fits on the pins. To convert/expand the radio, move the connector to the CON3 position. This will give you frequency coverage from 25.165 to 29.699 MHZ, and the CB frequencies will be on Band E of the radio. Again, this modification, and use of the radio on the CB frequencies, is illegal. This modification information is provided for shop/calibration and experimental use only.

Hello! a device called the Tail Light Relay; Located in the under dash fuse/relay box is the likely culprit...It controls the left/right brake lights but not the middle brake light...Also check that the L/R brake lights have a solid ground...Use an ohm meter...Zero ohms to negative battery terminal...


Guru........saailer


I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

Have you herd it off freq? Do you have a freq counter? How do you know that the person that told you it sounds off freq don't have their receive off freq?

if its on a freq counter, and shows not off freq, then the radio is not off freq. There is some other problem.. Or no problem because if it is just some one else saying it, maybe they are just too picky.

Things that could cause your audio to change. If its in your mobile, diving around will make your audio sound different to people. Antenna or feed line problems. If there is a problem with your antenna or feed line, it could make your audio sound bad or off to some one else.

Also, if this unit has been modded, has the clarifier been unlocked? if so that will change your TX freq.

If the unit is new and nothing has been done to it, there should be no reason why it is off freq unless some one has done something to it.

Sounds like a problem with your coax cable. You may not have the ends on the cable properly or the cable may have a kink or short in it somewhere. That is a sign of a very high SWR and usually means a short somewhere. If it is a mobile antenna make sure the little plastic washer on the antenna mount is installed properly. It is meant to insulate the antenna center conductor from the metal it is mounted to. It goes on top of the bracket and has a little raised collar on one side which should sit in the hole on the bracket.

Hello Thesilent1,

The other guest, has hit a very good point have you tried checking your mic? If not try changing it out. If you still have a problem do this; get a power meter and connect it to your antenna jack of the CB and the other end of the meter to the antenna this will put the meter in series with the CB and the antenna. then try to key the mic and speak, if the meter indicates 4watts PEP then the transmit function is working and you are getting out. The second test is to set an RF generator to 27.185MHz at -123 dbm or 5.1x-16 watts and use a 1kHz tone to modulate the signal, couple the signal to the antenna with an insulated wire loop and this will allow you to test if you can receive signal. These two tests will show if you can transmit and receive. I believe the problem is with your mic, but I have provided two tests that will prove if you can transmit and receive, so you are ready to test. Let me know how it goes.

Thank you,

Shuttle83

weather can effect your meter .Those meters are not very accurate just a base line get a good swr meter and then check it.If your getting good radio checks it could be the potentoimeter is dirty . Radio shack sells contact cleaner and lube try cleaning it . That might help