Understanding unexpected amp draw.
I have a 12v accessory plug socket that has a light on it and I was curious how much keeping it plugged in would affect my battery. (everything I read said it wasn't an issue, but curiosity sent me checking)
When I used my harbor freight multi-meter I saw that it was pulling only 0.02 amps with no load. I then tested it with a load, so I plugged in a usb charging plug which also happens to tell me the amp draw through it.
~Here is the problem~
My multi meter reads 0.48 amp for the "12v accessory socket" PLUS the "USB charger", when the USB charger alone shows 0.9 amp draw by itself.
Am I doing something wrong?
I would expect the total draw to be closer to 0.92 amps not the 0.48 that my multi-meter reads. (0.9 amps for the USB charger + 0.02 for the accessory socket that the charger is plugged into)
When I used my harbor freight multi-meter I saw that it was pulling only 0.02 amps with no load. I then tested it with a load, so I plugged in a usb charging plug which also happens to tell me the amp draw through it.
~Here is the problem~
My multi meter reads 0.48 amp for the "12v accessory socket" PLUS the "USB charger", when the USB charger alone shows 0.9 amp draw by itself.
Am I doing something wrong?
I would expect the total draw to be closer to 0.92 amps not the 0.48 that my multi-meter reads. (0.9 amps for the USB charger + 0.02 for the accessory socket that the charger is plugged into)
