74 shaker

Does anyone know the correct relay number for the relay that opens the shaker door on a 74 or a current issue relay that will work?

Are you referring to the vac over electric switch or the solonoid within the shaker itself?

Hi Tony
Is there a relay or thermal type switch somewhere on the firewall or engine? I acquired a 74 ventura with a shaker. The guts inside the shaker are there and the solenoid and vacuum operate when benched but there is no harness from the bottom of the shaker. I amtrying to find out what prompts the solenoid to operate under acceleration.
Thanks

There is a vacuum inlet valve solonoid switch. OEM part number is 495326. They are very hard to come by. It is essentially a switch that is actuated by ported vacuum, so when you open the throttle, vacuum actuates the contact points and then sends voltage to the shaker actuator. I was lucky enough to find a new one on ebay, but paid through the nose. good luck!

Thanks Tony that is the info I was looking for.
I got mine working by luck. I found an old vacuum advance or ac/heater door actuator(not sure which)The one I found happens to fit in the saddle where the solenoid was mounted. I ran a piece of hard wire from this actuator to the prong on the door and it opens with acceleration and closes 3/4 when at idle. It shuts altogether with ignition off. I think I got lucky. Why didn't pontiac do something like this to begin with?
Thanks again
Dennis