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The simplest advice is to check the power connections. If connected to the cigar lighter / power outlet of the car, remove & reinsert the plug into the outlet. Still no luck? Try powering up the detector in another vehicle's cigar lighter / power jack. If it works - try again in your car. The problem is not with the detector, but rather with the installation in your car. If wired directly to an accessory terminal or other place in the car, check the connection(s) and cable for damage. If you can't try it in another car, try plugging another device into the outlet to see if it works or check and replace any blown fuse for the outlet. You should consult your car's owner's manual for the fuse box location - and the location and amp rating of the fuse for the outlet. Check the power cord. Make sure the cord is fully inserted into the detector - not hanging in the jack. The opposite end - that goes into the cigar lighter / power outlet *may* have a built in fuse in the tip. You should check to see if the center tip of the plug unscrews to provide access to the fuse. If it does, replace any blown fuse with the same type and amp rating and try again. If you were unable to check in another car and you are still unable to power up the detector, there may be an internal problem with detector itself. In this case, contact the manufacturer for additional help.
You need to check the fuse for both the car's cigar lighter AND the one in the GPS power plug (that goes into the cigar lighter outlet). Both must be good for the GPS to charge and power up.
I don't know if your friends cord worked in you car - or hers - so you're going to have to find out if it is the cord fuse or the car fuse. Since her cord worked on your GPS, start by using HER CORD connected to YOUR GPS in both cars. If it works in her car, but not in yours, check & replace your car's cigar lighter fuse. If or when it works in both cars, disconnect her cable and connect your cable to your GPS again. Connect into your cigar lighter. If it works, you're done. If it doesn't work, disassemble the plug at the end of the GPS cord (cigar lighter end) and check and replace the fuse if blown. You should be good to go at this point.
Please rate this reply if found to be helpful - good luck!
so you replaced a blown fuse to the cigar lighter and it still dosent work?.. then the wiring was compromised before the fuse blew..you need to repair bad wiring to cigar lighter and/or lighter itself internally melted /failed due to your air pump asking for more electricity than the cigar lighter could deliver..once repaired do not use the air pump there again ..good luck