Join Date: Feb 2013
Location: Cambridge, UK
Vehicle: R171 SLK350 (2004) Black, 7G-Tronic, Airscarf, Parktronic, Red Heated Seats, AMG Bodykit, STUNNING!
Other Toys: C320 (W203 2000) Auto, Sadly Departed R170 SLK320 (sob)
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I had exactly the same problem with mine yesterday, for the third time in as many months. However, I know what the problem is with mine, it just doesn't get used enough! Anyways, like you, I hooked up my other vehicle to it, but it doesn't make much difference. HOWEVER, if I rev the other vehicle whilst it is attached by the jump leads (I put a brick on the throttle!) to my 320 for 5 minutes (and not less) then it will start. I will have to bite the bullet now and take the battery off the car and charge it correctly..... and go for a few more long drives! Good luck.