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11

Since you lost power to your 12v accessory socket at the same time as the other systems, I can’t see this as being an computer malfunction. This sounds to me like you have a fault in your main fuse box which is taking out a number of circuits. There may be a bad connection of one of the main fusible links. Unbolting them and cleaning may fix it. You may ...


3

You may have a loose or corroded engine ground connection. The next time you have the electrical failure, leave the ignition switch ON and, using a voltmeter, measure voltage between the negative post on the battery and any shiny clean metal part that is bolted to the engine block. This should always read zero volts, or nearly zero. If it reads something ...


2

Welcome to the site, and thanks for putting in a good amount of details. The fact that you have replaced the battery and your seat motors still work when you have the issue eliminates a bad battery or main battery connection. The symptoms sound a lot like a computer issue to me because the computers control the dash lights, ignition, either the computer isn'...


2

This sounds like you have a power leak somewhere draining the battery as it sits overnight. This could be a simple as a map light being left on or a trunk light or something similar staying on due to a faulty switch. The other cause of a power leak would be a short in a wire or component that isn't bad enough to blow its fuse but enough to drain the ...


1

I had a similar problem with my car late last year. The car will go totally off and few minutes later turn-on the dashboard again. After few days of struggle and investigation asking battery guys and electricians for help, I discovered that the cables to the battery terminal were loose. The problem totally went away after tightening them. Hope this helps...


1

I have no idea of where in the car to look for it but this sort of behavior sounds thermal to me. Something delivers power when it's cool but goes open circuit when it's hot. A couple of thoughts on this, I don't know how practical given the situation: 1) When it's failing look over the circuit with a multimeter. I would connect the leads together ...


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