We are scratching our heads by an odd problem with an ignition kill switch in a Spec RX7.

The old four post switch was causing a battery drain. We'd get 14 volts at the alternator, 9 at the battery. So, we replaced it with a Sparco 6 pole switch. We didn't use the two auxiliary posts.

Initially, this seemed to work. 14 volts at the alternator, 13.3 at the battery. At idle, flip the switch and the engine shuts off.

However, if we rev the engine up, flipping the switch does nothing. When we let it go back to idle, it will again kill the engine.

Anybody have any ideas?