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Electrikal problem on an Audi RS6 4B B-Turbo

  • Themis
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8 years 4 days ago #16605 by Themis
Hi There, I will first write the Story of the car.
Customer came for an Automatik Transmittion rebuild. to take out the Tranny i needed to take out the Engine too.
After the rebuild i put everything back together. During the Work i discoverd a few broken wires on the wiring harness. I fix them.
I test drove the car 1 hour before the customer came and everything worked fine.
I put the car car on Lift to install some Plastic Parts and since then car didnt start again.

Im searching 2 Weeks now to find the Problem and im really done! So i need your Help.

The problem is that the Engine has almost 5Volts! When i took the Battery cable out of the Alternator the Engine has 0,70Volts.
The Alternator is New.
I checked the starter and is working, but when i crank the Engine (sometimes) i hear the solenoid of the starter cliking but the starter wont move.
The customer sow the Problem himself. We both checked the Wiring Harness and found some more broken cables. I fix them all but i cannot find from where the engine takes Voltage. Fuses Relays and so on are many times duble checked.
the small wire of the Alternator and the Starter are together on one plug and are ending in a fuse and one relay, those are good.
I cannot explain more the problem and sorry for my english but i need Help

thanks in advance
Themis

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8 years 4 days ago #16617 by Ben
What do you mean by the engine has 5 volts? With alternator hooked up and what is voltage with alternator disconnected is ,70? Is that .70v or , 70v? If you have 12v measure at battery but not at engine than we need to measure voltage drop on positive and negative . On a side note we don't have that car stateside but many of them have a main ground cable that hooks to engine cradle and engine block

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8 years 1 day ago #16700 by Ben
Could someone delete this was a double post the vehicle was fixed in the other post

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