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My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
The first thing to check is to check and see if there are any loose power or ground connections leading from the battery to where the cables run and connect to or at the battery itself.This includes the power input cables at the fuse panels.If there is an issue found it will need corrected as a loose,damaged or corroded wire or connection will cause this here.
If this was already checked or is checked and found o.k. let me know so we can continue.
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The other issue I have seen is a fault with the electronic ignition switch itself.I have seen this switch fail before causing voltage loss to certain components in the past with the switch itself needing replaced.This should be tested and if found to be faulty it will need replaced.
It can be the ignition switch as one or more of its contacts may have failed but some of the other contacts in it may be working o.k.I would have this checked/tested to see if this is the cause for sure.
If the ignition switch is o.k. this sounds like a loss of power or ground causing all of these issues and the fuse panel wiring as well as all power and ground leads will need checked to pinpoint and repair this.In some cases it can be difficult to pinpoint an electrical issue like this here without seeing the vehicle but the switch or a loose or disconnected or damaged power or ground sounds to be the cause.
Let me know if you need anything else and feel free to rate my help.