Firefighter316

I've had my mustang for almost 4 years now and I have never had a problem out of it before. About a month ago I was getting on the interstate and I got on it and all my light on the dashboard, headlights, radio, I mean everything went out and it made a loud buzzing noise. Since then every time you get on it and it reaches 70 all this happens over and over again. It's a very dangerous situation especially at night and I didn't know if anybody else has had this problem? Thanks for the help.

Lethaldosage423

It's pretty common to get a water leak, it causes corrosion on electrical terminals and a module. Not sure of the specifics but I'm sure someone will chime in!

Firefighter316

Great thanks so much!

rls82959

You may want to take a peek at the Smart Junction Box and check
the carpet for signs of water.
It's on the inside passenger side just in front on the door.
Water would leak in and get into the SJB and cause corrosion and all
types of electrical issues.
I'm not sure about the 06, but for 07 Ford put a adhesive piece of vinyl over
the SJB which diverted the water over the SJB door and down to the carpet.

Nuke

Your issue sounds quite similar to the electrical gremlins caused by the infamous water leak but could also be associated with a weak battery and/or alternator (also another chronic issue which plagues the earlier S197's). There's a TSB for the water leak.