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Welding Vehicle Battery. Use 2fairly good 12 volt starting batteries with a good charge on them. But its a risk.
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The problem lies with the ECU and the welder sharing a single conductor the vehicles body. I show this and more. From this evaluation it is confirmed that welding a vehicle does risk damage to the ECU and disconnecting the batterys negative terminal will mitigate that risk.
Sure you can weld by using your car battery.
I ususally leave it pegged 110A. Antra Auto-darkening Welding Helmet Battery Replacement. How to Protect the ECU While Welding on Your Car. To fail to do so can have two possible outcomes.
