Clock Schematic

Where can I get the Wiring diagrams for the timer on an older Whirlpool wall oven?
I have a Whirlpool wall oven from the 70′s and I need to know how to place the wires (red, white, yellow, and black) on the clock/timer. I have called Whirlpool and they don’t have records for ovens that old. I had a repair man in and he said he could not place the wires without a schematic. I have to figure this out because the oven will not heat if the circuits are not complete, and a new oven would cost over $1000, which is way out of our price range.
Call around to some used appliance dealers and see if they have one you can look at, or if they have the schematic. Good luck!
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