SavouryLobster

Exactly has the title says. When I put the accelerator down a little bit more than usual, my inside battery warning light flickers until I let off the gas.

I've asked around and found it could be that my alternator is about to go, or I may just need a new serpentine belt? What are your guys' thoughts on this?

Secondly, where id the alternator?? Sounds dumb but I've searched throughout the engine bay and can't find it. Even had a friend who's my mechanic check it out and he couldn't find it on first glance either.

I have no problems with voltage from the battery as it was recently replaced and I checked it, still perfectly fine.

Thanks in advance.

G0to60

I think you're on the right track but I would lean more towards the belt slipping since it only happens on acceleration.

Here's a pic of an S4 4.2 as I think it's pretty close to the allroad 4.2. You can see the alternator on the bottom left of the engine.

thejulex

bottom left of engine, requires major yoga skills to get it out, like most stuff in audis.