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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

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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.

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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 

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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. 

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I would always advise people to disconnect the battery, but normally don't do it myself :D

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The battery is actually a lovely current sink, almost perfectly designed to absorb voltage spikes generated by welding.

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I was more concerned about upsetting ecu's by removing battery leads and cutting power off to them. Dd

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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.

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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 :ph34r:

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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

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