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Discussion Starter · #1 ·
So I recently got air suspensions for my audi r8 2009 v8
and got a ton of fault codes after because of a broken fuse

after installing a fuse behind the passenger seat gave out not quite sure why? anyways we decided to use the copper wire technique and check if it would start after that, it worked but then my two relays gave out. We later found out that the fuse became a way for the voltage to overload the relay and burn it and then well it burnt my ECU. after that my brake vacuum pump also had a short, and we aren't sure why.

note: The air suspension system is hooked to the 12v socket in the frunk and directly to the battery, I've asked my installer if it was safe and suggested we use the cigarette lighter instead. But the guy refused and says his air suspension system wasn't what broke my car. (still investigating)

week prior to installation of the air suspension system my R8 V8 2009 was in the shop not running for at least a month without a charger. Would this have caused my car to run out of battery and cause the short?

My questions are
1. why did a fuse pop the moment i was about to recieve my R8 from the shop
2. can a flat battery cause a short due to the amount of power the air suspension is asking?
3. Is this something else i should know about audi r8s?
4. did the air suspension brake my car?

any input would be very much appreciated!
 

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1: How is anyone on here supposed to know that?
2: Flat batteries don't cause shorts.
3: Get someone who knows what they're doing with R8's. Theses are cars that can get expensive quickly as you are about to find out.
4: maybe.
While the suspension may well have caused the fuse to pop, bypassing it with wire has led to the further damage. That was plain stupid. The fuse popped for a reason, you should have investigated why first. At least replace the fuse and see if it happens again. Obviously you need to replace the fried parts first now, then disconnect the suspension system and see where you're at. If all is good then it would point towards the install. You could try and reconnect the suspension system and see if the fuse pops again. I'm not sure why it needs to be connected direct to the battery as that will cause a drain. Would be better to connect after the ignition I would have thought.
 

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we decided to use the copper wire technique and check if it would start after that
At the risk of stating the obvious, do not ever bypass fuses. They are there for a reason. I know some (including pros) think it is OK sometimes. But, how do you know for sure? If you are wrong (and you were) you can fry components (you did.)

First thing is first, disconnect the air suspension, replace the fried parts, and see if the car comes back alive. If it does, drive your car away to another place to reinstall the air suspension.

I know it is hard decision, but you are better off cutting your losses.
 

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Yep, disconnect the air suspension and take it to someone who really knows how to install them. Sounds like this other "Mechanic" did not follow the instructions to the letter. If you can, read the instructions for install yourself. Read it 5 times, 10 times if necessary, to really fully understand how it is suppose to be done.
 

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of course he's gonna deny it but that's clearly the only variable that changed in the equation. also, dont ever jump fuses with wire. they blow for a reason. expensive lesson learned sadly :(
good luck getting everything sorted out as inexpensively as possible
 

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Asa followup I would suggest the OP strongly consider seeking out either a dealer or top flight auto electronics shop capable of running a proper electronic diagnostic, find any surprise fault codes. Current surges can very well migrate to all sorts of unintended spots, especially since the default protection (fuse) was bypassed.
 

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Discussion Starter · #9 ·
Asa followup I would suggest the OP strongly consider seeking out either a dealer or top flight auto electronics shop capable of running a proper electronic diagnostic, find any surprise fault codes. Current surges can very well migrate to all sorts of unintended spots, especially since the default protection (fuse) was bypassed.
It already has it went to the brake system, what only bothers me is why that one fuse gave out
 

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Discussion Starter · #10 ·
Yep, disconnect the air suspension and take it to someone who really knows how to install them. Sounds like this other "Mechanic" did not follow the instructions to the letter. If you can, read the instructions for install yourself. Read it 5 times, 10 times if necessary, to really fully understand how it is suppose to be done.
The thing is it's his system he build it, what bothers me is why it blew up a fuse and what caused it to do so, could it have been just a flat battery?
 

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The thing is it's his system he build it,
There are two factors in play here. The system he built, and your car. He might be familiar with the air suspension system. That doesn’t necessarily mean he is familiar with your car. That is why people in general take their car to specialists, who are familiar with your car.

Let me put it another way; you do not take your R8 to a Porsche dealer, not because Porsche dealer is bad in his job, but because he just does not know your car.


what bothers me is why it blew up a fuse and what caused it to do so,
There could be several reasons, including
  • An overloaded circuit. Something is drawing more power than what the system was designed for.
  • Ground fault (short circuit) happens when a live wire gets in contact with the ground (that practically all metal parts under the hood.)
  • Sparking happens when there is a lose wire (contacts are not well secured.)
  • Voltage spikes. Unregulated connections can cause this, resulting in catastrophic results.

None of these are good for your car. However what should really bother you is that fact that your installer ignored these possibilities, and bypassed the fuse. That alone should raise a huge red flag for you.


QUOTE="StormX, post: 1616728, member: 106179"]
could it have been just a flat battery?
[/QUOTE]

Based on what I described above, no, chances of a flat battery causing your fuse to blow is very very very unlikely.
 

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Discussion Starter · #13 ·
There are two factors in play here. The system he built, and your car. He might be familiar with the air suspension system. That doesn’t necessarily mean he is familiar with your car. That is why people in general take their car to specialists, who are familiar with your car.

Let me put it another way; you do not take your R8 to a Porsche dealer, not because Porsche dealer is bad in his job, but because he just does not know your car.




There could be several reasons, including
  • An overloaded circuit. Something is drawing more power than what the system was designed for.
  • Ground fault (short circuit) happens when a live wire gets in contact with the ground (that practically all metal parts under the hood.)
  • Sparking happens when there is a lose wire (contacts are not well secured.)
  • Voltage spikes. Unregulated connections can cause this, resulting in catastrophic results.

None of these are good for your car. However what should really bother you is that fact that your installer ignored these possibilities, and bypassed the fuse. That alone should raise a huge red flag for you.


QUOTE="StormX, post: 1616728, member: 106179"]
could it have been just a flat battery?
Based on what I described above, no, chances of a flat battery causing your fuse to blow is very very very unlikely.
[/QUOTE]
would a live wire in the air suspension system cause this? or could his system be drawing too much power?
 

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If I have to bet, I would say it is putting too much load on the system. I always always connect “other devices” using a voltage regulator and before and after fuses.

If not, there is probably a short….
 
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