It is impossible to know without an idea of how you want them to behave and intend to interconnect them. A schematic, or basic wiring diagram with a narrative of operation would make helping much easier.
The relays board and the schematics do not match.
The schematics suggest there is a P9 to connecct the 12 Volts, but I can not find it on the board: View attachment 253750
@LowQCab , The schematic does not show a voltage regulator from 12 Volts to 5 Volts.
There is a P9 mentioned in the schematic with separate 5 Volts and 12 Volts pins.
Where did the Schematics come from ?
None of this is surprising when ordering from China.
The Schematics don't show a Voltage Regulator,
and also don't show the Input-Polarity-Selection-Jumpers.
Look at the Wiring-Picture I sent You earlier.
The Jumpers determine whether the Low-Voltage-Signal-Inputs need to all
connect to either, "Ground", or "Plus-12-Volts", in order to energize the Relay-Coil(s).
I'm guessing that they will be set-up to require a Switched-Ground by default.
The Jumpers "might be" marked "HI" or "LO" indicating a Ground, or 12-Volt, Input requirement.
A Switched-Ground arrangement is the preferred way to go.
This type of Board is pretty hard to damage if You hook it up wrong.
All You can do is take your best-guess as to what
the tiny symbols on the Circuit-Board probably mean, and then go for it.
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