When reading the DC resistance of a pickup you find differences in the reading or ohms that you read with volt/ohm meter. It is commonly thought the coil that has a higher reading will give you more output. This can be true in some situations but in others it can mean that the magnet wire has become stretched when winding usually by to much tension or to fast of a winding speed. There are several types of tension devices used for winding coil. Some winders use “whisker discs” that are round flat discs with mono-filament of different diameters extending from the edges to help drag or keep the magnet wire from whipping off the spool of magnet wire as the coil is wound. Others can be felt pads to add tension or a series of pulleys and springs to add tension to the magnet wire. If the winding speed is to fast the magnet wire can’t de-reel fast enough and it can cause the wire to become stretched. This will make the magnet wire thinner and causing the DC resistance to become higher. This usually happens when hand or scatter winding when the magnet wire is held to tight as it is drawn from the spool. Tension is usually measure in grams and there are specific measurements and gauges for measuring magnet wire.