Hi all,

First issue with my new car. I was driving home tonight and noticed the battery light came on during hard acceleration.

The car starts and drives fine with no loss in power. It's a tdi vrs, 13 plate with 12k on the clock so their shouldn't be any problem with the battery or the alternator?

Anyone else come across this? Any help would be appreciated.

Cheers, Stu.

Does it do it when sitting and just revving it up a bit??

Check the voltage at the battery with the engine off and with the engine running. Should be around 12.5 volts and around 14.5 volts.

Sounds like overchargiing to me.

Let the warranty sort it out.

Edited 27 March, 201412 yr by FatblokeVRS

On acceleration is a wire being stretched between alternator and car/battery which is causing it to drop voltage feed?

Sounds like a slipping auxiliary belt especially if accompanied by a squealing sound.

Perhaps some fluid leaking onto the belt.

Thanks for the replies!

No squeeling noise from the belt or anything. It seems you can't rev the car when the hand brake or brakes are on! Saftey feature I'm guessing.

Belt looks fine, no fluid residue on it. Don't have a volt meter but the connection looks fine.

Taking it into the dealer later today. See what they say.

Well I took it to the dealer yesterday and guess what, It didn't do it! They had it for two hours and found nothing but a historic fault code for a heater valve. I even took one of the tech's out when they said their was nothing wrong. Hopefully won't happen again.

Could also be the freewheel clutch on the alternator.

 

And you should get a multimeter. Everyone should. They're cheap.

This would do.

http://www.toolstation.com/shop/p11867?utm_source=feed&utm_medium=googleshopping&utm_campaign=googleshopping&mkwid=3sOIK1gg&pcrid=26798343503&gclid=COG70_iVu70CFXMPtAodOzEAdA

Thanks for the link. I really should get one.

Can borrow one from a mate but haven't seen him yet. Been for a 200 mile drive since with no problems. Perhaps the dealer has fixed something, maybe a software update.