Ahem,,,, if I were you I would disconnect BOTH the positive and the negative. We always do that when we weld on any car. I've heard of airbags blowing, computers getting screwed up and all kinds of interesting stuff. It's cheap insurance, believe me.:p

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95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K