Jump to content

Recommended Posts

I have my son's VW Passat. I will be fitting the new battery tomorrow. If I disconnect the existing will I lose any of the settings, mileage etc. I could run two cables from the new battery to the car before disconnecting the old battery, so that the supply is constant

I am hoping that it as simple as fitting a new battery to my 3A

Any advice would be helpful.

Richard & B.

Link to post
Share on other sites

Richard,

in most cases it will reset an internal memory, like for errors detected in the ECU system. But milage will not be affected. 
If there is a radio with a pin code, I would install a temporary feed for belts and braces.

If it is a more modern version car like less than 10 years old, I would certainly do as Peter recommends above.

Waldi

Link to post
Share on other sites

What ever you do Don’t just disconnect the battery.  You MUST connect up another one in tandem so there is a constant supply of current. If you don’t you could loose some of the stored information. 
Halfords seems to be a good idea so if it goes wrong you can blame them  Good luck 

Cheers

Gordon

 

 

Link to post
Share on other sites

It looks as if I was sensible to start this thread. I already have the battery, delivered by Lincon batteries, who make a very good replica for the TR3 battery. So I think I will have to find the jump leads and take some care next time it stops raining. What would be a smaller cable that would work?

Thanks Richard & B.

Link to post
Share on other sites

What’s the year of manufacture?  If it’s recent then you’re unlikely to have a problem. Settings, mileage etc will be stored in flash memory. If it’s an automatic the gearbox adaptations might reset to default but that’s no problem as it will relearn.  As I said before the windows will need resetting so that the safety sensors work. Usually you fully open a window and keep the switch operated for a few seconds. Then close the window and hold for a few seconds. Repeat for all the windows. You don’t need a parallel battery. 

Edited by peejay4A
Link to post
Share on other sites

Modern cars have a socket into which a temporary supply can be plugged in order to keep the vehicle's brains alive.  In my Citroen, it's under a flap in the cubby/elbow rest between driver and front seat passenger.  Halfords (and other companies) just carry battery with connected adaptor, and plug this into the socket, then disconnect and replace the car's battery.

Ian Cornish

Link to post
Share on other sites

This is a 15 tear old VW Passat and has covered a high mileage, but runs well. Today it was dry  weather until I opened the bonnet. It was clearly going to rain soon. So I disconnected the battery and removed it and then fitted the new one from Lincon Batteries. The operation was swift and went well. No lost spanners in the engine bay:).

I went to start the engine and it worked immediately. The only difference was the clock which was easy. I did try the windows as suggested and the radio did not have a code.

However it is the same as my TR3a. Once you have fixed some problem it seems to run better, or is it just in the owners imagination. The VW is now smoother when starting from cold.

Thanks for all the advice.

Richard and B.

Link to post
Share on other sites

All Volkswagens retain the codes in the ECU you can change the battery without any extra precautions

 

                                                                                               Harvey S. Maitland

Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
×
×
  • Create New...

Important Information

Please familiarise yourself with our Terms and Conditions. By using this site, you agree to the following: Terms of Use.