HOW TO : GM HEI Distributor Pick-up coil troubleshooting

DIS ignition systems are much better in terms of reliability with less moving parts to fail however there is still a handful of us that cling onto old school distributors. The most common of the bunch is the ever reliable GM HEI internal cap. But even these fail from time to time. The bushings go bad and the coil wears into the housing causing a short and in effect a no start situation. Here’s an easy way to test to make sure your pickup coil is still in operating condition.