Vacuum Advance Solenoid

Disconnect hoses and electrical connector. Connect a hose to distributor vacuum port on solenoid and blow into hose. Air should come out vacuum port to carburetor. Plugging vacuum port to carburetor should shut off air through solenoid. Connect a jumper wire from one terminal to ground. Connect other terminal on solenoid to a 12 volt source. Air should now come out vent port of solenoid. Plugging off vent port should shut off air flow through solenoid.