Intertherm outside unit - s3ba-036k - does not run

Measure the voltage across the line. The outside unit normally runs on 220 Volts. Measuring each side of the line to ground will give 110 Volts. If your outside disconnect is of a fused type one fuse could be blown. If a fuse is blown on one side of the line you will read zero volts differential across the line.

Check the type of fuse used in the disconnect. Make sure the proper size time delay fuse is installed on both sides of the line at the disconnect.