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Showing results for tags 'MSD6AL and Pertronix'.
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I have a MSD 6AL, Pertronix set-up with an aftermarket Mallory mechnical advance distributor. The tach on the car used to work just fine, now any electrical load causes the tach to bounce all over the place. Even without a load it bounces. You have to guess the RPM as someone in the middle of the 'bounce range'. When a load is applied (brakes or turn signal) the bounce is even more pronounced. The tach bounced in harmony with the turn signal. As the load is removed, it bounces up. Otherwise the car drives fine. While likely not related, the battery is dead. I figured this was due to inactivity over the Winter, but it now won't even take a charge. I'm going to run out and get a new battery today. It was a few years old (I think around 4 or 5). I know that Big Phil had a similar issue with is turbo car that seemed to happen when his car was cold. This still lingers when up to regular operating temp.
