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Help! 1980 450SL - Positive Terminal Connection Under the Hood

1878 Views 5 Replies 3 Participants Last post by  Ruindr
Hi all -

I have a 1980 450SL that I'm about to have to tow across the country. The battery is dead (but can be jumped), but I don't want to risk losing the vacuum to the trunk and not being able to get access to the battery to jump it if I need to while on the road.

I understand there is a positive connection under the hood that can be used as a jump point, but I haven't been able to find anything that shows definitively where it is.

Based on what I've read, I THINK it's where I have circled in the attached picture, but I was hoping someone might be able to confirm before I try to jump and end up frying something :D Can someone please let me know if this is indeed the right spot?



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Even with a dead battery and no vacuum you can always open the trunk with the key if you have locked the car previously with central locking. By why lock it while you tow it?

On a side note, towing a car with auto trans should be at max 30-35 mph and not for a long trip. Better then to remove the drive axle at the flex plate.

Or maybe I completely misunderstood your post?!
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