Having electrical problem with new car desperate for help

[05Grimstang]

Ok so I just got a 2005 mustang GT yesterday I'm having a problem with it

Ok so I hit my brakes and the fog lights cut off and the headlights will dim. Sometimes the interior lights will come off for a half a second


Then sometimes the window switch won't work and I have to play with headlight switch and it will work

Currently my right brake light won't work and I switch out the bulbs. Also my speedometer is like pinned at 140 when I'm at a dead stop. If someone could help me out I would be so greatly appreciated. Car has 73k miles on it. Everything is great besides this but if I can figure this out the dealership said they will fix it no questions asked

Thanks guys


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[Dino Dino Bambino]

Check the smart junction box in the front passenger side footwell for water contamination. If the carpet's wet, you have blocked cowl drains with accumulated water from the cowl entering the cabin through the cabin air filter.
It's a well-documented issue on the S197 with a TSB.

 

[thump_rrr]

The speedometer issue may be unrelated to the smart junction box issue.
Look up stepper motor issue.
It's a cheap diy fix if you're handy with a soldering iron.

 

[05Grimstang]

TSB MEANING THERES A RECALL ON IT??


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[stkjock]

TSB MEANING THERES A RECALL ON IT??


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TSB - Technical Service Bulletin. Not a recall.

 

[05Grimstang]

Damn. Dave right?? Had the old vert SC. ITS me kc I had the 06 windveil blue all hooked up motor wise


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