Another thought-the OVP relay might be sticking but I believe the ABS light would come on as well. Not cetain how you connected your blink tester, can it damage the ecu..........not sure about that, I suppose it's possible.

With the key removed test voltage at fuse 7.......if voltage is present I might suspect a broken ignition switch. I like to approach electrical matters one step at a time, in my eyes the switch needs to be confirmed or eliminated as a/the cause.