Ge built in microwave and oven. Jkp86

SOURCE: GE Microwave Model JKP85 Plate does not rotate

Usually this is a bad turntable drive motor in the floor of the microwave but the only way to know for sure is to do some electrical testing with a volt/ohm meter and the wiring diagram located within the appliance.

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SOURCE: i have a ge jkp86 electric oven the oven will not

First thing that comes to mind is to make sure you are getting the correct voltage to the oven, you need 220 / 240 volts, check your breakers, fuses ,etc.
It is possable for the microwave oven to operate even if the power supplied to the oven is only 110 volts, but that low of voltage is not enough to power up the ovens heating elements.
If all seems well there, then maybe the oven element has failed / shorted ?
Good luck !