Economy - Longevity - Performance
The #1 Source of TDI Information on the Web!
Forums Articles Links Meets
Orders TDI Club Cards TDIFest 2016 Gone, but not forgotten VAG-Com List Unit Conversions TDIClub Chat Thank You

Order your TDIClub merchandise and help support TDIClub

Go Back   TDIClub Forums > VW TDI Discussion Areas > TDI 101

TDI 101 Got a simple/basic TDI question? Are you a newbie (new to the forums). Feel free to post your question here.

Thread Tools
Old November 2nd, 2019, 18:42   #1
vintage red matthew
Join Date: Jul 2019
Location: Sedgwick Kansas
Default Is it OK to weld on my car?

I have, in the past always been told that if you need to weld with an electric welder on a car you should remove the cable from the negative battery terminal to protect, primarily the diodes in the alternator. That was many years ago and the electrical systems in cars are much more complicated and sensitive, not to mention expensive. Can I safely use a mig welder on the body of my car if I unhook the battery? Would it help if I removed both battery cables? Thanks.
vintage red matthew is online now   Reply With Quote
Old November 2nd, 2019, 19:00   #2
Veteran Member
Join Date: Nov 2010
Location: Kelowna

Removing the ground cable from the battery and insuring that your MIG ground strap is close to your work area you will be fine

Some will go as far as to unplug the harness to the ECU before welding on the car

Sent from my iPhone using Tapatalk
mr.loops is online now   Reply With Quote
Old November 2nd, 2019, 19:12   #3
Veteran Member
Join Date: Mar 2014
Location: St.Paul, MN
TDI(s): 02 golf ALH
Fuel Economy: 42 stock, 47-49 now

I've welded on my mk4 with the battery still hooked up
I've killed a durango with the negative unhooked

to be real safe unhook the negative cable and plop it onto the positive cable to make sure stuff stays well grounded by all possible avenues
[486] is offline   Reply With Quote
Old November 2nd, 2019, 19:24   #4
Veteran Member
Join Date: Jul 2019
Location: land of 10,000 lakes

i welded on my mk6 tdi with no ill affects. just ground close to what your welding.
DivineChaos is offline   Reply With Quote
Old November 2nd, 2019, 21:08   #5
vintage red matthew
Join Date: Jul 2019
Location: Sedgwick Kansas

Thanks. I thought I was probably OK but I just wanted to be sure.
vintage red matthew is online now   Reply With Quote
Old November 2nd, 2019, 21:22   #6
Veteran Member
iamatt's Avatar
Join Date: Apr 2006
Location: Rosharon, Texas
Fuel Economy: 45

I welded on my mk6 and yeah ground as close as possible. No problems for me. Good luck.

Sent from my Pixel 3 using Tapatalk
2014 Jetta TDI sedan (new) ,2014 TDI Jetta Sport Wagon 6MT (Flooded) Amsoil HDD3000 20K OCI, GSP Mod (RIP Rosie 4/4/2015), 2011 Toyota 4 Runner SR5 (Flooded), 2007 Duramax (Flooded), slightly modded GSPv2 is here, Bellatrix "Bella" Hunting God's County, katygsp.com
Amsoil Dealer -
iamatt is online now   Reply With Quote
Old November 2nd, 2019, 21:27   #7
Veteran Member
AndyBees's Avatar
Join Date: May 2003
Location: Southeast Kentucky

My son had welding done to the exhaust pipe down from the flex joint on his 2000 Jetta TDI last week without disconnecting anything ...... car starts and runs fine!
This is the TDI Club, a place to share experiences & ideas, ask for help, etc. Welcome Newbies! Sarcastic and condescending posts shouldn't be welcome.
AndyBees is offline   Reply With Quote
Old November 2nd, 2019, 22:22   #8
Veteran Member
Join Date: Mar 2011
Location: Northern MD
Fuel Economy: Race: 12mpg, Gandma:65mpg

as long as the grounds are disconected on the harness and the battery AND you UNPLUG the ECU, yes you should be fine
Mongler98 is offline   Reply With Quote
Old November 5th, 2019, 22:09   #9
Veteran Member
Geordi's Avatar
Join Date: Jan 2002
Location: Somewhere between Heaven and Hell. But it is really hot here in S. Florida...

I welded on a Mk4 without unhooking anything. Car started and drove fine, and now it can even follow voice commands!

(no it can't, but everything else is just as it was)
I always knew beans would give me gas. But I never expected Diesel!
Geordi is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Pinch Weld reilljp VW MKVII-Mk7 Golf family including Golf Wagon (~ 2015 +) 6 January 29th, 2018 14:44
exhaust bracket weld snowden VW MKIV-A4 TDIs (VE and PD) 3 February 21st, 2016 09:01
Fyi jb weld $5 GD Ontario 0 July 10th, 2010 11:21
Need a mechanic that can weld jinjabread_man Quebec 1 November 28th, 2007 12:59
Pinch Weld POWERSTROKE VW MKIV-A4 TDIs (VE and PD) 1 May 8th, 2007 03:48

All times are GMT -7. The time now is 18:51.

Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.
Copyright - TDIClub Online LTD - 2017
Contact Us | Privacy Statement | Forum Rules | Disclaimer
TDIClub Online Ltd (TDIClub.com) is not affiliated with the VWoA or VWAG and is supported by contributions from viewers like you.
1996 - 2017, All Rights Reserved
Page generated in 0.17302 seconds with 13 queries
[Output: 89.17 Kb. compressed to 76.22 Kb. by saving 12.95 Kb. (14.52%)]