I'm replacing a cooktop with a used cooktop. The wiring is shared with a wall oven. The wall and oven have 4 wires - red, white, black and bare. The outgoing cooktop has 3 wires - red, white and black. The incoming cooktop has 3 wires - red, black and bare. Shoul I wire the bare wire from the incoming cooktop to the bare wire from the wall or the white wire from the wall?

Thanks,
Sixto
87 300D

The incoming cooktop is missing a white wire. Is there a wiring sticker on the new cooktop?

Not necessarily -- especially if it doesn't have any electronics like a clock, it may just take 240V for the burners and not have a neutral leg for 120V between it and one of the hots. Pure 240V devices do exist.

If there's no white wire:
* Red to red (hot #1)
* Black to black (hot #2)
* Bare to bare (ground)

Good point. I am (possibly) corrected.

No sticker. It works with red, black and bare hooked up.

Thanks!

Sixto
87 300D