Really depends how much current they draw ??
A melted loom is not good, burnt out switch gear maybe
Your really best to drop a relay into the circuit
Earth relay
Switch to main beam

Positive to battery
Switched positive to lights

Or just get another switch from maplins, rs or the like

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you win some, lose some, crash some
K+N filter, snorkel removed, homemade kev mod (with his blessing), co raised,
Pipeworx cans, r1 led back light, under tray removed, small indicators, handguards, cnc short levers,