Scott Collins
- Sep 6, 2017
- 2
- Joined
- Sep 6, 2017
- Messages
- 2
I have a guitar that has 2 9v batteries powering an 18v pre amp. The circuit should only be active when the cord is plugged into the input jack. The batteries keep draining even when the guitar is not in use and the cord is unplugged. How can I use a multi meter to tell if power is being drawn from the batteries even though the circuit should be open?