My car's OE block heater can take the round connection, but I was cheap and got one with the square plug instead. BUT: with this setup the grounding tab does not connect to anything!

If I were to get another cord I would get the round connector so that the engine / heater is properly grounded.

-J

__________________
1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.