AMP Superseal connectors.
Guess that is why they are marked AMP, eh?
DIY kits are surprisingly cost-effective: https://www.amazon.ca/dp/B07KVJD9MD/?tag=rippca-20
http://www.te.com/content/dam/te-com/documents/automotive/global/1654292-2_AMP SUPERSEAL 1.5.pdf
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