Led flashing off AC current, any takers?

 Not sure what AC current has to do with this, but what I would do is either take a signal off the tach lead (on a Chebby coil-in-cap HEI it would even be called TACH on the distrib cap), or use injector pulse.

 Using the tach signal would give you a RPM based signal, while using the injector pulse would give you RPM based PLUS changes based on throttle inputs, ie. matting the throttle would make the lights get real bright even before the rpm picked up.. incandescent bulbs might be better for this though..

 Does he just want a glow coming out of the scoop, or does he want the individual LEDs visible?.. How many LEDs are planned on being used?

 Regards,

 Jim

 depending on the type of igntion system being used I'd probably start by wiring up a LED and wiring it to ground on the negative side of the coil. See what that does.. might have to use a power transistor and use the negative side of the coil as a trigger. By alternate do you mean that he wants them to wig-wag? Just a little bit more circuitry if that's the case.

 Regards,

 Jim

 Wig wag means lights that alternate.. best example would be emergency vehicle headlights..

 Yes, I'd try first wiring up an LED to coil negative.. battery positive to the LED package and negative to coil ground.. see what happens.

 Regards,

 Jim