Battery cut off switch Options

[dgraves]

I've got a slow drain in my battery. My guess is that it's from the 911 dash installed by a previous owner. After about a week, the car may or may not start. Is anyone out there using a battery cut off switch? There are a lot for sale, but many look similar and several have some bad reviews.
Thanks

[Keith914]

I also had a battery drain issue. I conducted testing by removing the negative battery lead, then carefully moving it towards the battery terminal looking for a spark which occurs about 1/16" distance (low surrounding light helps to see the spark) from the terminal. After researching this issue, I removed two in line fuses installed with a modern radio plus self powered woofer. This almost removed the significant spark at the battery (IMG:style_emoticons/default/piratenanner.gif) There is still a very small spark remaining which I assume is a discharge of capacitors in the MSD system. So far so good.

[Mark Henry]

Yes I meant to add the radio too should be disconnected as it will give a tiny spark as well. Old school radios without a clock should be OK.
Once you narrow it down to one circuit you can start by disconcerting wires from things on that circuit.

I'd disconnect the MSD just to rule it out.