So my 80a alternator is struggling and I have replaced the VR already, but it's still only putting out 12.7v and dipping as low as 12.2v sometimes when I have all accessories on. Also replaced battery last week as it was 4yrs old. This is a reman Bosch al66x and it has 105k on it now.

I'm thinking my best option would be to get a bigger alternator off another model.

Are there any bigger alternators that are simply plug and play, or are all of them going to require me to do some wiring? (I have no idea where to start if this is the case)

I want to check on any easy swaps before looking into more modifications.

Thanks,

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
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2003 Gray Mercedes ML350 - 122k