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Level 2 Charger Hack advice

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My e-golf is out of warranty and it no longer will do timed charging and thus I must charge manually and to 100% each time unless I set a timer and come back down to the garage and stop the charging. I have to first look at the estimated charge time on the car screen and then subtract 15-20 minutes to set the timer. This is complete BS of course, but the 'fix' from VW is $1500.

What I was thinking of doing is getting a smart relay and wire it in to the copilot wire circuit. I will have to break open my 'portable' charger, which I am comfortable with. So my question is, if I start charging and then use this relay to break the copilot circuit in an hour say, will that stop the charging ? Thanks