87 4.3 ser # ob825796 205 hp 262cid thunderbolt iv 4bbl . tested hall effect per. boatfix.com. iget 12 volts but when i break the field with cardboard or afeeler gauge i still read 12 volts.shot? oram i doing something wrong. also mygear on the dist. looks like its worn tothe point where it is real sharp and ready to start to break teeth. iwill be buying a new gear.