Courier Royale relay problem

[vanlifeson]

Got a courier Royale which when I key up, the relay chatters.
Tried a different relay and same thing. Been checking voltages but have had no luck yet. Any suggestions? Thanks!

[oldgeezer]

A 120uF 20 volt capacitor is on the relay coil to ground. Replace with a 470uF 25 volt capacitor. It has a polarity, so do not install backwards. If you cannot solder, just twists the leads from old capacitor to new capacitor together. The capacitor negative is marked with negative and possibly positive leads.