A/C causes ML430 to misfire/stall

[mars23]

I took my ML430 to a MB tech b/c my car will misfire or cut off (twice) if I turn on the A/C. Also, the check engine light will come on. When I turn off the A/C the car runs fine. The tech said the codes read MAF. He checked the car out for 2 days and said it was not the MAF. He said my AUX fan fuse was missing, which he replaced. But he said the A/C- AUX fans were drawing too much power. I have an Interstate battery 750. He said the negative batttery cable wire was corroded and the battery was leaking. He checked all other wires, but can't seem to find the exact problem. He suggested I get a new MB battery 800 or 900 through roadside asst. and replace the negative wires. Has anyone had this problem? Would a bad battery stall the car upon turning on A/C? Any other suggestions.

Thanks in advance.