If you are hell bent on doing business with a shady supplier - go for it! At your own risk.
Will messing with car's 12V wiring have a potential impact on said system's warranty coverage?
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Will Tesla necessarily find that out if you brought your car in for service for any other reason? It would be hard for them not to notice.
Will they note that observation in your service history? There is only one way to find out. Let us know how it goes down for you!
Others who might similarly curious, should be forewarned about the extra risk they will be taking on Hannshow, as a vendor with dubious support and warranty reputation.
YMMV,
a