int Relay1  = 4;                 
int Relay2  = 5;                 
int Relay3  = 6;                 
int Relay4  = 7;                 
int r_delay = 250;

void setup() {
//  Serial.begin(9600);
  pinMode(Relay1, OUTPUT);       // declare Relay as output
  pinMode(Relay2, OUTPUT);       // declare Relay as output
  pinMode(Relay3, OUTPUT);       // declare Relay as output
  pinMode(Relay4, OUTPUT);       // declare Relay as output
}

void loop() {
  digitalWrite (Relay1, HIGH);
  digitalWrite (Relay2, HIGH);
  delay(r_delay);
  digitalWrite (Relay1, LOW);
  digitalWrite (Relay2, LOW);
  delay(r_delay);

  digitalWrite (Relay3, HIGH);
  digitalWrite (Relay4, HIGH);
  delay(r_delay);
  digitalWrite (Relay3, LOW);
  digitalWrite (Relay4, LOW);
  delay(r_delay);

}