I'm on a slow connection so u tube won't work. Can you describe the test setup?

With auto ranging, 037.8 might be Milivolts = 0.0378 V . The best way to test for an amp draw is to use a clamp on amp meter. Clamp Meters within Electrical Meters / Testers - MCM Electronics Category I use an older Temna brand ( this is the house brand of MCM )

Make sure the meter can read DC , the less expensive ones don't read DC,figure on spending around $100 for something decent.

The big hitters for battery drains are trunk / glove box lights and shorted diodes in the alternator. Testing draw per circuit lets you find the specific circuit causing the draw.