Need Help--Electrical/starting problem

[bcredliner]

I have an intermittent starting problem. Sometimes it starts fine. Sometimes I will get just a click like a dead battery. I can shut it off and start it immediately after that and it starts fine. Once in a while there isn't even a click and none of the dash lights come on. I have jump started it twice. First time it ran until I reved it and then it died. I jumped it again, drove it 4 miles with no issue and got home, turned it off and it started fine.

What I have done so far:

This started with a dead battery. Battery was bad. So was first replacement.
I have the correct and good battery installed
Checked for corrosion at front and back battery cable connections.
Turned on air on max and bright lights when it was running- alternator adjusted.
Monitored the alternator for spikes or dropping below min spec--no issue.
Let it sit for 8 hours checked battery status, no drain.
When it won't start there is no voltage under the hood but voltage at the battery is normal. Right now it is reading the same voltage at the battery and under the hood.

I do have a battery cut off switch but I can't make it malfunction. If I can make it happen again I will check if there is voltable on both sides. I am using a multimeter for testing voltage. I am aware electronics are sensitive and jumped it properly.

Any idea what troubleshooting I can do or what the problem might be?