Just wanting some thoughts on my situation... I'm replacing an ancient Jennair downdraft cooktop with a new Whirlpool... My supply is black, red, and white (note the absence of green )...the Jennair, I discovered, was wired red to red, black to black, white to white, with the green from the cooktop just hanging bare in the junction box. The new cooktop is 3 wire, black/red/ground. Installation instructions say, red to red, black to black, cap the white supply and ground the green. So, I guess all this means that the old cooktop was wired improperly (that is to say, ungrounded) all this time? Do I have any recourse but to have the circuit rewired? Thanks for any guidance.