Strange problem which suddenly appeared

Hi Guys, i urgently need your help !

First of all i will introduce myself. I'm Ayk and live in Germany. I bought a Stang in 2008 and since then i'm superhappy with my Pony.

Since last week thursday i have a strange problem on my Pony

In the morning everything was fine. I moved my Mustang out of the garage and
at the evening i faced following problem:

If i enter my car, and put in the key, the control light into the cockpit for the high beans immediately goes (but no light from the Headlights) on and the beeping starts and continues. If i turn the ignition on this remains like that. If i start the engine, the beeping stops and the High beam light into the cockpit stays on.
But what is very strange, that the Theft indicator light into the cockpit flashes ALL the time. Also while engine is running.

To summarize:

- Radio NOT working
- Dome light NOT working
- Cockpit NOT working
- headlights NOT working
- turn signals NOT working
- door locks NOT working

The engine (starting and runnng), the temperature regulations with A/C, the mirrors and the Windshield wiper works well.

here a short video: http://de.tinypic.com/player.php?v=2rogx83&s=9

I did some first analysis basing on some information from this forum...

i removed the SJB to check if i have some water inside and checked the overall board. From visual aspect, everything looks fine.

Relays are checked, and all are working well. Fuses all are ok.
On BEC all fuses are ok and in the SJB as well.
Where the confusion starts, is at the accessory delay relay.
measuring at the pins i see folowing:
pin 30 = 12V
pin 85 = 12V
pin 87 = nothing (here i should have 12V when the relay becomes active)
pin 86 = nothing ! this comes from the Low current board.
When the relay will become active normally ??

Every idea is welcome guys

Did u check the battery and alternator?

Be careful when probing the fuse box it is very easily damaged.

Sounds like an bad ignition switch or weak battery or bad alternator.

Thanks guys for the quick feedback.

some questions (maybe i'm wrong):
- if the battery is weak, normally the engine wouldn't start and the windshield wipers wold not work, or not ?
- regarding alternator, is the alternator important for this phase ? i mean putting key in and starting ignition ?

Did't check the ignition switch but could be a reason. How i can check them ?

Thanks in advance for the turbo reply

regarding fuse box. What you mean with "it is very easily damaged." ?

These cars have shown themselves to act goofy when the battery or alt are not up to snuff.

So when there is wacky electrical issues, I always suggest KISS, check those first.

Mu$tang said:

...

regarding fuse box. What you mean with "it is very easily damaged." ?

Click to expand...

These fuse boxes use mini fuse sizes. Many multi-meter probes are much thicker than the fuse blades. If you use a multi-meter in the contact points of the fuse box you can permanently stretch the pins to the point where the fuse doesn't make contact. This is why there are test points on top of the fuse where you can take your readings.
You can also undo the bolts in the middle of the fuse box and lift it up and take your readings on the wires underneath.

stkjock said:

These cars have shown themselves to act goofy when the battery or alt are not up to snuff.

So when there is wacky electrical issues, I always suggest KISS, check those first. B

Click to expand...

This^^^^. The dash lights and chimes act possessed when the battery and alternator are going out. In most cases both need to be replaced at the same time. Mine did.

+1 on the alternator/battery. When my alternator failed, I was still able to crank the car and drive it until it shut down copletely. Thankfully, I was able to coast to my driveway when it happened.

https://youtu.be/iRyvCyNfc_w

today I found some time to check my problem on my Mustang... changed battery in the meanwhile but still have the issue.

Any hints ?