I have what I think is a parasitic current draw on my boat that is slowly draining the battery.

I don't really have any experience troubleshooting electrical issues. I read that I should pull the negative cable off of the battery and measure the current between the cable and the negative terminal. I am measuring about 1.5 mA.

It doesn't seem to me that this would be a very significant current draw. If I am doing my math right that is about 1 Amp-Hour per month.

Right now I have it on a float charger.

Is there something else I should take a look at?