Digital Sidecar relay ports: correct voltage?

[Ether]

Can anyone please tell me what is the correct voltage reading on the red&white wires coming out of the relay ports on the digital sidecar?

We are measuring 4.2 volts in the active state.

We have a Spike relay connected to a relay port, and the Spike is not working.

By "not working", I mean the Spike LED remains orange and there is no voltage across the Spike's output. We thought maybe the sidecar got damaged and is not outputting the right voltage.

There is 12 volts across the Spike input, correct polarity.

The battery is sufficient; it runs the motors that drive the wheels.

We swapped out the Spike and the new one doesn't work either.

We understand the following chart and tested all four states

red=0 white=0 brake (both outputs grounded)
red=1 white=0 reverse (reverse output polarity)
red=0 white=1 forward (normal output polarity)
red=1 white=1 brake (both outputs +12)

Unless there's something I'm missing, the only hypothesis that seems to fit the facts is that the signal voltage is not correct.


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