Yeah, this is going to be weighed down, that spare alternator alone weighs quite a bit.

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1990 300d 2.5 turbo
1995 E300d

You don’t need to take a complete alternator all you need to take is the voltage regulator better yet just replace the voltage regulator in your alternator I just did in my after it failed coming back from a 1,000 mile road trip good thing I’m a triple A member and I was able to start the engine with their help and make it home thanks to triple A they will help you in any state