Question about XRS-757 Radar Detector

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Cant find a replacement fuse for the power cord

I cant find a replacement fuse for my power cord for my cobra xrs 757 radar detector power cord

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The fuse is located in the cigarette lighter plug, at the end you will see a silver cap and then the disk that goes over the top of it, that will turn and then you will have the front open to replace the glass fuse that is in it... to find the fuse size, after the fuse is out look at the silver ends it will have the size stamped on it... it might be a 40 amp fuse. or 20 amp. just look at the silver sides on the fuse you will find that there... hope this helps you out

Posted on Jun 03, 2009

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Posted on Jan 02, 2017

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I rerouted the power for my Cobra XRS 9440 and I accidently reversed the polarity of the power cable when I plugged it in. It fried the detector... I'm pretty handy with circuits and soldering, I'm hoping...


Did you first check the fuse in the units power cord? The fuse should be in the part of the power cord that plugs into the lighter socket. A 2 amp fuse should be good enough.

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What amperage fuse goes in a police detector cigarette lighter cable?


check wattage on unit and divide by voltage (12v) that = amps required in fuse and then add 2
example 120w % 12v = 10 amps

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I plugged it into my aunt's 2007 accord and it wouldn't turn on, yet when i plugged it into my 98 accord, it worked fine. Help?


Have you tried to plug something else in the 2007 to see if the power is present? May have a bad fuse.

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At the end of the power cord for the radar detector the end screws off and there is a fuse for the radar detector itself. Check it....

If that isn't the problem post back for further help.

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-dan

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Replace power cord


The easiest way would be to go to Radio Shack.

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Cobra xrs757 X Band


The x-band is the considered a "trash band". It picks up things like automatic doors at supermarkets and such. About every radar detector made has an X band for non-police radar. There is no way to turn this band off on the XRS-757.

Holding down the dim button for 2 seconds turns the V alert on/off
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Dec 18, 2008 | XRS-757 Radar Detector

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Dec 10, 2008 | XRS-757 Radar Detector

1 Answer

Cobra XRS 757


There are 2 options for power plugs that can be purchased from Cobra for the 757. The straight 12V power cord is listed under item number: 420-030-N-001 and the coiled 12V power cord is listed under item number: 420-026-N-001. Both can be purchased from Cobra by calling their order line at: 773-889-3087 or visiting www.cobra.com

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I called cobra support(777-889-3087) and it was around $6 plus shipping for a replacement speaker.
the correct phone number for cobra support is 773-889-3087 and can be found on their website.
Cobra was very courtious and I also got my replacement speaker for my XRS-9500.!

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