Use and Construction of A Noise Sniffer

The noise snifter, along with the vehicle's radio, locates hot spots which generate noise interference. These hot spots are found in the harness, in the upper part of the dash, or even between the hood and the windshield. The sniffer may be made from an old piece of antenna lead-in from a mast of a power antenna. The longer the lead-in, the better. Make the noise sniffer as shown. The antenna lead-in with the black coating and braided shield stripped back (3) becomes the sniffer. When you plug the sniffer into the radio's antenna socket, the snifter probes and searches out hot spots.
1. Disconnect the antenna and plug the snifter into the antenna socket while you listen to the complaint noise.
2. Turn the radio volume up.




3. Search for the noise source (3). When you check for noise on a wire, you get the best results when you place the snifter (2) parallel to the wire (1).