Its intermittent.
And goes something like this:
I put the key in, turn the key to start, but nothing. No engine turning, no sound, no lights, like a dead battery. When key is turned, voltmeter across the battery terminals reads zero. So, I give up, and a few minutes later I have dash lights, etc. again.
So I put the charger on the battery, but it doesn't charge, why? because the battery IS fully charged. Besides, this battery was recently load tested, and was fine. Plus I have another brand new battery that I swap in and eventually, the same thing happens. So not the battery.
Not the starter, because I swapped in a spare unit I had, then it still happened, so I bought a new starter, and still happens. So not the starter.
What makes my car start? Disconnecting the battery for 5 seconds. I reconnect, and the car starts like a champ.
I tested my starter relay, and it seems fine. So what is it? Another relay somewhere? Something else?