DC barrel plug

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  #1  
Old 11-02-15, 01:22 PM
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DC barrel plug

I'm trying to replace the plug on my radar. The power wire has several colored wires that have all been clipped except the red and black which were soldered to the +12 terminal. It appears the metal shielding has been stripped on one side then soldered to the side terminal for a ground...is this correct?

I replicated what appears in the original plug but keep blowing fuses...


 
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  #2  
Old 11-02-15, 01:42 PM
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It would be more likely that the red wire connects to the center pin and the black connects to the shell of the plug.
 
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Old 11-02-15, 02:56 PM
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That's what I thought but I even looked at my partners and it seems to be the same..here are pics of his
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Old 11-02-15, 03:03 PM
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It is a moving radar unit so I assume the red and black wires each power a separate crystal
 
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Old 11-02-15, 03:25 PM
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Old 11-02-15, 04:10 PM
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This is a coaxial or barrel plug.
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That is called a cigarette lighter plug.

In the picture below..... the red is connected to the center clip that contains the end of the fuse. In the picture that clip is pushed left and is covering the ground connection from our view. The wire in the clear tube, which should be black, goes to the blue clip.

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Old 11-02-15, 05:35 PM
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In the red box you circled, both the red and black wire are soldered to the terminal from the factory...so I know that is correct... I just wanted to make sure that the shielding can be used as ground and someone hadn't rigged it at some point.

I thought cigarette plugs were also called barrel plugs...sorry about the incorrect terminology.

There is continuity between the shielding and all the wires...so there has to be a short somewhere else...all this started because I lost the tip and couldn't find a replacement
 
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Old 11-02-15, 06:02 PM
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Hard to see in the picture but yes..... the shield can be used to carry the ground connection.
 
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