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Best advice is to get the Harley Shop Manual for your particular year Sportster. They have a 3 page diagnostic chart in mine for 1998. Follow through the test procedures outlined to tell if the ignition module or a related part is bad.
You may need to make a special wiring harness test cable to be able to check certain voltages while the module is connected.
Wiki User
∙ 12y ago
Wiki User
∙ 15y agoThe only way to test a module without buying a lot of expensive equipment is to take it to AutoZone or Oreillys or Napa. They will put it on the testing machine and test it for you free. Sometimes a dealer will test it for you but with a 91 model you will do better by going to the parts houses.
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