I'm trying to locate my battery drain. I put a multi-meter on it. The amp reading between the disconnected negative battery cable and negative battery post was 0.13 amp. What's an acceptable reading?

 

I found the drain. It was the audio 15 amp fuse. It supplied the battery back up to the radio. I disconnected the negative battery cable. Then I put a test light between the negative battery post and the battery terminal. I started pulling fuses one at a time and watched the test light. Soon as I pulled the audio 15 amp fuse, the light went off. I put the multi-meter on to double check. Sure enough...no amperage draw at all. I used a wiring harness when I installed my headunit and no other device was running off that backup memory wire. I'll disconnect the wiring harness and see if the drain goes away. If it does, something is wrong inside my Clarion headunit.