2005 mustang gt electrical problems

[theRedStorm]

So everything in my car is fine but the moment I Rev or drive, my cars entire electrical system dies. Checking the battery voltage, I saw it reading 16 Volts. Could this be a regulator issue? Everything works fine until I start driving/revving. My guess was the alternator was dying but if the voltage is reading 16, it couldn't be that issue.

 

[07gts197]

Its the alternator, theres a circuit breaker that trips when the current gets too high. Same thing happened on my 98 p71.

 

[theRedStorm]

Hmm Ok I'll replace the alternator tomorrow and see if that fixes it. Thank you!

 

[theRedStorm]

Ended up swapping my battery and that seemed to have fix the issue. I think the battery was the problem. It wasn't holding a proper charge causing the alternator to put out more voltage trying to charge it. This is my guess. I'm gonna run it for a while on the new battery and see if any issues arise

 

[07gts197]

Hmm Ive never heard of that but if it fixes the issue thats all that matters.

 

[theRedStorm]

It was crazy. I revved the car and my battery meter when up past H on my dashboard. And when I hit 3k rpm, all the electronics turned off (radio, internal lights, headlights,, fog lights, rear brakes lights). I was so confused. I thought it'd be the alternator but couldn't understand why it'd overcharge but luckily a new battery fixed it. Hopefully that was all it was.

 

[Dino Dino Bambino]

Overcharging is usually caused either by a faulty voltage regulator, or by a faulty alternator diode that's allowing an AC ripple current to leak to the positive battery post.
I hope a simple battery replacement solves your problem but I'd also be pleasantly surprised.

 

[Iceman62]

Did it store any DTC/OBD codes? Might want to check and/or take 'er in for an electrical diagnostic check, while it's still running.

 

[bujeezus]

Have you rechecked your voltage since the battery swap? 16v is high and might be why the other battery crapped out. You may have just temporarily put a bandaid on the problem (alternator).

 

[theRedStorm]

So far everything has been okay. I suspect that my aftermarket HID kit might have been the culprit. I left them on for 2 more weeks and then the same issue arose again. Im just surprised they ran perfectly fine for 2 months and then started to crap out. I restored my headlights to normal ones and the car has been fine for a little while right now. Fingers crossed. Last battery had a bulge in it too probably from overcharging. Anyone have an aftermarket Hid kit on their car and experienced this

 

[theRedStorm]

No codes were found Just said check charging system and all my electronics were bugging. I removed my hid kit, and I'm going to see if that was the potential issue

 

[07 Boss]

Replace the alternator. Replace it with a 2010 one too. I went through 4 alternators before swapping in a 2010 one. Haven’t had an issue since.

 

[theRedStorm]

I'm looking at getting the PA 200 amp alternator on AM. Seems like that fixes any power drain issues

 

[AndrewNagle]

I'm looking at getting the PA 200 amp alternator on AM. Seems like that fixes any power drain issues

Skip the PA and get a 2010 Denso.

 

[theRedStorm]

Ok