With ignition off there is a very slight drain. I took the +ve wire off the battery, connected a multimeter between the +ve terminal and the wire. There is a 0.01 volt drop across what should be a zero volt link.
The wire goes to the solenoid and the fuse block. It's either the solenoid or elsewhere in the system that it's losing it. I checked the fuse block link as most likely but no voltage drop there. The bike's wiring is OK.
I connected the solenoid by itself. It shows the 0.01 volts. Looks like the solenoid terminal is not isolated like is should be. I suspected the built up of gunk letting a few electrons pass.
Pulled the solenoid apart. The terminal bolt holds a copper plate inside. There's nothing else. It is just sitting in the plastic housing waiting for the armature to connect it to its mate across the other side. So this bolt/plate piece is sitting on an insulated plastic housing and losing voltage. :?
I cleaned the insides with solvent. Put it all back together. Put in in the bike. the same thing happens.
![Confused](https://www.thegsresources.com/_forum/core/images/smilies/confused.png)
This leak is very small, but it's enough to discharge a new Yuasa battery in a couple of days.
Why does an insulating plastic housing decide to not insulate?
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