Vehicle & Technical > Discovery

light bar wiring

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colin14:
thanks guys, plan was to to run the 4 off the main beam and fit another couple on the nudge later on with seperate switch. whats the problem with powering all 4 on 1 relay, will be using 27amp wire and 30amp in line fuse. thanks

Saffy:
If you or someone happen to fit 4x 100watt bulbs in the future than that will be very close to 30amp current draw on one hot relay.
Long as you stick with 55w bulbs then 1 relay on the heavier gauge wire that you state will be fine.
About 16amp for 4 x 55w, two relays would allow for lower gauge wiring runs which *may* be easier to route. 
Two relays with the heavier gauge wire might be less volt drop on the longish run and therefore brighter lamps. (maybe do that math to see if relevant in real world)

tack43:
It's always best to "over-engineer" for any later upgrades than have to do it all again!

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