Hi Zook, thats actually only going to be about 20 amp a relay and this should be no problem and leave the 30 fuses in the relay.
The cable running from the battery's positive terminal to the relay’s common input ( B ) should be at least 8B&S ( 7.9mm2 ) and the cable running from each relay output ( L1 & L2 ) should be 6mm auto ( 4.5mm2 ).
If you only have 6mm auto cable then run two lengths of this from the battery to the relay’s input ( B ).
Don’t forget that you will need to run 6mm auto cable from the neg side of the lights back to the battery’s negative.
Cheers.


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