Hi csireeves,
Most conventional LED lightbars and foglight kits come with relay/harness assemblies capable of carrying a
30A load. Some R/harnesses will handle 50 amps or more like the ones I use:
To determine what the led bar's R/harness is capable of, see what size inline fuse the kit comes with. If the fuse is rated for
30A you wouldn't want to load it with both leds unless your sure that their
'combined power consumption' does not exceed
27A; leaving a
'10% current in-rush (surge) margin' to prevent false
'MUST TRIP' breaker/fuse parameters. If the supplied wiring harness is at least
'8ga' then it will safely handle up to
60A for relatively short distances i.e. 15 ft! Then the relay (and fuse) could be substituted with a 50 amp relay like the one pictured above; I paid $12 bucks for a pkg of four with 'socket connector/wiring pigtail' on ebay:
4 Pair 50 Amp 12V Bosch Style Relay Harness SPDT 100 Copper Wires | eBay
That'll be very easy for you! Just cut the (Round) switches off of the supplied harnesses. Instead of adding a
'STAKE-ON' CRIMP CONNECTOR to just one harness switch lead, join both switch leads together e.g., green with green wire, blue with blue wire...etc and then tie-in your new A.O.B. switch; allowing it to control not one, but
'BOTH' harnesses; "see below":
Double check your new switch wiring color code with the manufacturer's instructions to be sure it matches the one above. Make a copy of this wiring scheme for yourself to glance at while you're waiting for your parts to arrive, it'll help you form a mental picture of how the plot works!
Best to you!