thanks,

i have tried disabling the light checks which didn't solve the problem. your analogy explains why, i guess its the said PMW that is noticed as noise. not the light checks.

thanks also for indicating the risks of what i've done. fortunately i don't think there's any damage so far.

i can change the relay to the likes of what you have shown (i have searched around and found suitable models), but that still doesn't solve the problem does it?

the PMW would still be felt by the relay as noise?