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Discussion Starter #1
OK so you may have seen my body control failure thread. Managed to get the unit off and past onto a specialist. He seems to think that the unit has received a power serge and killed our control unit/module by jumping the car incorrectly


Ive contacted greenflag and they will contact the contractors used in our area (Bourhunt Garage). Guessing they're going to denie its their fault. It seems well documented on here that a back jump start and cause this issue.

Any thing i could use as proof or documentation would be appreciated? Im f*****d if im paying the bill for the mistake of someone else :rolleyes:
 

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I was reading somewhere earlier that this can happen when jumping a car, but it's usually cured by disconnecting the battery for a while...

Unless they connected the jumping battery the wrong way round (or used a 24V supply), I dunno if you've got much of a claim :confused:
 

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Discussion Starter #3
According to the chap looking at the unit one of the epproms has become corrupt, he seems to think they connected the booster up in the wrong order and maybe had a spark or two where proper contact wasn't made at first causing the surge.

I'll be taking this the full way if possible, if they won't take responsibility I'll be starting a small court aim I think.

He is bringing the unit back on Friday anyway for more testing SO that means it's had no power for a week so maybe as you say time without power could help. We shall see
 

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Strange for an eprom to go corrupt... Possibly an internal connection has blown though (seen that happen a long time ago when I was messing around programming them on a BBC B!).

Dunno if they'll be the same kind in the car that I remember though!
 

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Discussion Starter #5
We shall see I guess

I'll keep this thread updated too just for record. I REALLY hope this is due to them BUT if it's not then it's just sods law I guess. Fingers crossed it'll work when plugged in on Froday
 

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Think one of two things will happen. Either they'll say it was faulty, and that's why you called them out for assistance, or they'll just claim on their own liability insurance (or stump up the cash) to pay for your repair.

I think they'll open box 'A', but you never know... It's going to be very hard (IMO) to prove that what they did caused the fault.
 

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I had exactly the same thing but with the AA. They refused to accept any liability and it ended up costing me 600 notes for a new ECU.
Just how exactly are you supposed to start en Alfa with a flat battery? I dread the day I have to jump start my car in case the same happens again!
 
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Isn't correct way on modern cars as follows?

Positive to positive on both batteries

Negative from the battery of the 'jumper' to an 'earth point' (not the negative on the battery) of the dead car

BTW - had to 'jump' mine a little while back with no issues :confused:

*disclaimer* ^^ that maybe pub talk BS :lol: , but have heard it from more than one source
 

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thats the way i've always been told to do it too, + to + first then - on the charged battery to a metal point on the chassis somewhere a good distance from the battery if possible
 

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Discussion Starter #11
Well after a quick google session pretty much ever result said on modern cars it's the way to do it. The breakdown company didn't do that. Straight onto the battery and that's that.

I will royally kick up a stink if they refuse liability
 

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I'm trying to think of a technical reason why you can't connect the ground terminal of the batteries together.
The vehicle battery ground is linked to the chassis and all metal casings on the car so it should make no difference at all where you connect the donor battery.
 

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As far as I understand it, the only reason to connect somewhere other than directly on the battery -ve is to avoid sparks near the battery which can cause it to explode due to the hydrogen gas given off when it's charging. It's nothing to do with voltage spikes. The battery -ve is connected directly to the car chassis anyway so makes no difference electrically.

Funnily enough when you reconnect the battery in the car you obviously have no choice but to connect the -ve on the battery in which case you can't avoid a few sparks anyway. I guess the jump start method is just playing safe.
 
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It's more to do with sparking and the remote possibility of fire/explosion,
I thought.

Jumping from the battery pack should be okay.

It's when you hook up another car that all the nasties really start.
In terms of surges/spikes from the alternator etc.
 

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iv always connected negative to negative 1st, then the positives together with no issues, some do the positive 1st and thats were the issue lies, and i have seen the aa, and rac and such like do it this way. as long as the negatives are connected 1st to the car or the battery, as its an earth it doesnt matter. its when they do the positive 1st:mad:

had them do it on my punto, and promptly fried the ecu, towed me to the garage, garage replaced the ecu and coils under warrenty, then charged the AA:lol:

iv never had any issues when connecting the negative 1st, even on my stilo which has the most sensitive, tempermental electrics in the world:lol:

but in the end a negative is a negative, be it the battery or the chassis of the car, there both earthed the same way;)
 

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Maybe the problem is they are jumping it off a battery that is being charged by a running engine so it's spiky? alternator voltage rather than stable battery voltage although this shouldn't really make any difference. Sounds to me like Alfa ECU power supply protection design is just a bit dodgy.
 

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I had to jump start my 156 a while back. Did it from dad's car.

Car started OK but immediately Airbag light lit. Fried airbag ECU :mad: (yes I did try and clear error codes with Alfadiag first)

Got a second hand one for £50 all sorted.
 

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I had to jump start my 156 a while back. Did it from dad's car.

Car started OK but immediately Airbag light lit. Fried airbag ECU :mad: (yes I did try and clear error codes with Alfadiag first)

Got a second hand one for £50 all sorted.
Was your fathers car running when you connected the leads ? Was the ignition turned on on your car when you connected the leads ? Just interested
 

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Ther is no difference jump starting a car than to connecting a fresh /fully charged battery.Done literally hundreds , connect the leads wrong and you will be screwed!!
Negative off first and on last, always!
If you ground the positive lead by accident, with a spanner when tightening clamp for example, and you have already fitted the earth then there will be sparks a plenty and a risk of damaging delicate electrical components.
 

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Followed instructions that came with jump leads.
 
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