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Missing fuses need fuse box diagram for 2003 freightliner century ST keeps blowing fuse for radio and cb

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  • james morgan May 11, 2010

    do you know which fues is for the radio and what kind of radio is it???????

  • Anonymous Mar 20, 2014

    dash board out and lighter


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Does it do it with the radios disconnected? if so need to check the wireing. in the truck for shorted against something. if only with the cb hooked up blowing fuse then need the cb checked out.

Posted on Dec 08, 2009

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1 Answer

We have a cignus 818 base radio, it blows fuse after a while, i can transmit for about a few minutes then it blows fuse.

final or main IC getting ready to burn out.Have it checked by a tech.If its the final then replace the driver also.

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Cobra 18 wx st ll hade it for about a year, now it blows fuses when it powers up.

change the reverse polarity diode. Put one in that is one number higher like 1n4003 to a 1n4004 .It will handle more volts so you shouldn't blow any fuses.

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FL 2000 freightliner fuse box diagram

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The vehicle fuse blows when it is powered on?

this could be only two things either the fuse is to low in amps or the protector diode has blown and will need to be replaced

Jan 20, 2011 | Cobra 75 WX ST 40-Channels Handheld CB...

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My 18 WX ST keeps blowing fuses

sounds like its been hooked up backwards,the resistor is goig to need to be changed.

Apr 21, 2010 | Cobra 18 WX ST 40-Channels Base CB Radio

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Cobra 75 wx st fuse keeps blowing. As soon as I plug the transceiver into the connector box the fuse blows.

Hi and welcome to FixYa,

Initially, check the reverse protection diode, D18 (1N4004). It would be located / connected at the power board of the DC connector.

Good luck and thank you for asking FixYa.

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Hello there
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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...

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CB keeps blowing fuses

There are a few common reasons the fuse keeps blowing:

1. The transmitter final transistor is bad, it usually is directly connected to the 12v source and not switched by the power switch.
2. The power wires were accidentally reversed I.E. positive to ground, neg to 12v. There is a protection diode on the circuit board that did its job and is now shorted. it will keep blowing fuses until its replaced.

Dec 30, 2008 | Cobra 18 WX ST 40-Channels Base CB Radio

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Blows fuse.s when i hook up the coax

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

Sep 02, 2008 | Cobra 29 WX NW ST 40-Channels Base CB...

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