JUMP LEADS WRONG WAY!!

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Linas

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Hello everyone,
I have Audi a4b5 1.9 TDI 2000 year model. it was dark, my battery was flat so i jumped the car but placed leads wrong way. after about 10 seconds i noticed that and quickly removed them. the problem is car starts but battery light is on. i have changed alternator too but its still on... any suggest?
 
I did something similar about 4-5 years ago. A mate took my battery out whilst I was on holiday, then replaced it the wrong way round. When I connected the battery, the smoke goblins started escaping from the wires! I had killed my alternator.

Have you tried charging the battery since? Or better still, take it to a local battery shop and they can usually run tests to see if you've killed a cell.
 
No actually i got new battery and it is tstill the same.. could it be a relay?
 
So its new alternator and brand new battery, but battery light is still on the dash... car starts ok but looks like alternator is not charging the battery so i presume its one of the relays or is it ECU?
 
Wires are ok mechanik checked them all.
 
Mechanic should have been able to check the voltage across the alternator too
 
Is there a chance that it is ECU?
 
You need to check for 12v on the alternator signal wire, with the wire disconnected from the alternator. The cluster sends 12v down that wire, if it finds its way to ground the light comes on. When the alternator is running it applies 12v to the other end of the wire, which causes the light to go off as both ends are at 12v.

I suspect you might have damaged the cluster, but you wont know without some testing.

Theres a easy fix to stop you doing this in future, ALWAYS connect the negative lead directly to the engine block or chassis. That way if you try to connect the live to the negative battery post, you get a big shower of sparks, but crucially dont actually apply any reverse current to the car itself.
 
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aragorn said:
Theres a easy fix to stop you doing this in future, ALWAYS connect the negative lead directly to the engine block or chassis. That way if you try to connect the live to the negative battery post, you get a big shower of sparks, but crucially dont actually apply any reverse current to the car itself.
Click to expand...

This was the way my dad always got me to do it and has stuck in my head
 
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