defender dinky Posted April 23, 2019 Share Posted April 23, 2019 Hi. Just acquired discovery 2 02 plate. Need to do a small weld on chassis do I need to disconnect battery earth lead and if so will it upset the ecu's when I reconnect the earth lead, thks Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted April 23, 2019 Share Posted April 23, 2019 I never bother, only time I managed to fry something when I was welding an alternator bracket, on the engine, with the alternator in place(!) You live and learn! Leave battery connected IMHO. Quote Link to comment Share on other sites More sharing options...
defender dinky Posted April 23, 2019 Author Share Posted April 23, 2019 Righto thks Quote Link to comment Share on other sites More sharing options...
Stellaghost Posted April 23, 2019 Share Posted April 23, 2019 Have done loads of welding with battery in place but I always make sure earth is as close as possible to area to be welded Regards Stephen 1 Quote Link to comment Share on other sites More sharing options...
monkie Posted April 24, 2019 Share Posted April 24, 2019 I disconnect the battery negative terminal out of habbit on my 110 when I weld even though the most complex electronic item is the alternator. When I used to work at an accident repair centre they used to clip a surge protector across the battery terminals. Quote Link to comment Share on other sites More sharing options...
ThreeSheds Posted April 24, 2019 Share Posted April 24, 2019 I would always advise people to disconnect the battery, but normally don't do it myself Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted April 24, 2019 Share Posted April 24, 2019 The battery is actually a lovely current sink, almost perfectly designed to absorb voltage spikes generated by welding. Quote Link to comment Share on other sites More sharing options...
defender dinky Posted April 24, 2019 Author Share Posted April 24, 2019 I was more concerned about upsetting ecu's by removing battery leads and cutting power off to them. Dd Quote Link to comment Share on other sites More sharing options...
Ally V8 Posted April 25, 2019 Share Posted April 25, 2019 13 hours ago, defender dinky said: I was more concerned about upsetting ecu's by removing battery leads and cutting power off to them. Dd There is no problem at all in disconnecting the battery on a D2, you will have to reset the clock after,and maybe put the code back into the radio if it needs it. It won't forget any of its running settings in the BCU,instrument pack or SLABS ecu. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted April 25, 2019 Share Posted April 25, 2019 I'd suggest you're more likely to cause problems by not disconnecting them - an ECU that's forgotten its settings is an easier fix than one that's caught fire 2 Quote Link to comment Share on other sites More sharing options...
EeEk Posted May 17, 2019 Share Posted May 17, 2019 Welded 100s of cars and never disconnect the battery Ive welded exhausts with the engine running to make sure theres no leaks Ive never had an electrical issue but did set fire to a sierra seatbelt when welding a sill once, that was a wee bit off a bonfire inside the door pillar Quote Link to comment Share on other sites More sharing options...
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