[Jon Stratis]

What is the Digital Sidecar (DSC) doing? There are two small LEDs next to each of the relay ports that should light up to show which direction it is signaling.

If those aren't turning on, check the following:
- Code
- Power LED's on the DSC - all of them should be lit up
- Try replacing the DSC.


If they are coming on but the Spike isn't responding, try the following:
- Get a multimeter and probe the DSC output. You should be able to see the pins switch voltages with the lights.
- If the pins look good, plug the PWM cable back into it and probe the other end of the cable, where it plugs into the Spike.
- If the cable looks good, check how you're inserting it into the spike. Make sure it goes in straight, push a little bit to make sure it sits fully, and ensure ground is on the correct side (check that it matches ground on the DSC!).