Using Nano..SSR turn on by USB power not by External 5V supply

Hello,
I am trying to switch 3 SSRs to turn on different AC motors.
Finally reduced circuit to turn on single SSR for light bulb but could not figured out the issue.
Am using a Nano...SSR turns on the light when nano is powered by usb. But when i power it through 5V 2amp external adapter light does no turn on.
SSR has input and output indicator.
input indicator turn on when PIN is high for both cases.
Only output does not turn on when powered by external 5V supply.

I have tried different adapter and different SSRs.
I am connecting external 5V supply through VIN and GND of nano.
How is nano able to supply required current for SSR drive through USB but not through 2Amp supply?
I just remove the USB cable from computer and turn on 5v adapter -No other change.
Help is much appreciated.

Measure voltage at vin
it 3V -usb connected
5V- external supply.

“I am connecting external 5V supply through VIN and GND of nano.”

Try connecting external 5V supply to 5V and GND.

It works when i connect to 5V.
thanks ..
Problem solved.. :slight_smile: