Those are some beefy relays. Tycos at 12v and 40A will happily switch on or off anything. I don't seen flyback diodes on that board - it really should have them, no excuse for not having a 10 cent part on there. (It's keeps the relay coils from inducing a reverse voltage/current when they are deactivated and the magnetic field of the coil collapses- messing up other electrical stuff)
Edit I see it's Bowling and Grippo. No wonder.
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