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Abnormal behaviour with multimeter?

Hello,

I am seeing what I consider to be strange behaviour with the multimeter. When I have it in a circuit, the relay doesn't activate when the multimeter is measuring voltage, yet it does when measuring amperage. Is there a reason why?

Following the tutorial here: https://www.youtube.com/watch?v=fsd_ZLD1EvQ

Code to make life easier:

void setup()
{
pinMode(13, OUTPUT);
Serial.begin(9600);

}

void loop()
{
int motor = 13;
pinMode(motor, OUTPUT);
digitalWrite(motor, HIGH);
Serial.println("High");
delay(3000); // Wait for 3000 millisecond(s)
digitalWrite(motor, LOW);
Serial.println("Low");
delay(3000); // Wait for 3000 millisecond(s)
}

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