2012Mustang has no electrical power at all

[Dyron]

Hello everyone, I have a big issue. Went for a drive and when I got home,was pulling into the garage and the engine died and simultaneously lost all electrical power to everything. The battery and alternator was checked at O'Reilly and we're good. All of the fuses are good including the fusible links at the battery. The pcm is getting power at the incoming connection. Trying to find all of the grounding points so I ordered the Haynes manual this morning.
I need some advice as to what the possible causes are and if I need to take the car to a professional.
Thanks for any help.

 

[DieHarder]

The Haynes manual is okay for basic services but not much else. The main grounds are the black cables at the passenger strut tower; underneath the passenger side motor mount and the one on the firewall at the back of the engine. If below doesn't help it can sometimes be worth the diagnostic fee (~$200) to have the car scanned at a dealer... once you know what needs to be fixed/replaced you can decide whether it's worth the dealer doing it. Hint: Usually better/significantly less expensive if you tackle the repairs yourself. Use OEM parts wherever possible. Again, better to source them yourself online.

Here's some online manuals. Not perfect but light years ahead of Haynes.

Ford Workshop Service & Repair Manuals - fordrepair.info Home - 2005 Mustang

Ford Workshop Service and Repair Manuals, 2005 Mustang

iihs.net

Assuming you have a No Crank/No Start condition I'd start here: https://iihs.net/fsm/?d=9&f=Step 2- No Diagnostic Trouble Codes (DTCs) Present Symptom Chart Index.pdf

Good luck.