| power eventually come back or once things failed it just stayed that way ?(i.e, car was never restarted).... Trying to better understand it this is an occasional intermittent issue or a total failure? I do have my doubts it's the alarm system --- most just do a simple interrupt of the starter or EFI circuit. It's a lot of extra work (ie., very heavy duty relays, large thick wire, etc) hooking up something that disrupts full ignition power and risks issues such as yours with a big failure while car is being operated. One way to trouble shoot is to take simple voltage readings with a meter along the points that connect between the battery, ignition switch and post ignition switch - key on (in case issue is something else). Start inside the fusible links box, over to ignition switch harness connector, etc. Could even do this with a simple LED tester light - but I prefer using a meter to get an actual voltage reading... It's possible this is a grounding issue too that's very specific to the failure. Voltage readings along the circuit path can help with identifying this too. FYI -- Don't assume if you do get good voltage readings that all is good either. Over the years I've run into weird circuit issues on other cars where the voltage readings were good but things like a power window motor wouldn't work. Turned out to be frayed wiring that could not carry all the current load needed but still made a connection and showed voltage (that was a fun one to figure out).... I do think in the end this will turn out to be something simple like a bad connection in the ignition switch or perhaps a bad connector inside the fusible links box (but NOT the main feed connection there - since you have power to other things).
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