Originally Posted by mdub707
To start, I am by no means an electrician. I'm a mechanical guy. I hit things with hammers and I turn wrenches. I know just enough electrical to get myself in trouble.
Ok so I have 4 55w Hella 500 series fog/driving lights that I am installing on my 06. I have the dual alternator setup, so I shouldn't have any issues keeping charge going. (I dont think...)
I am wanting to wire these up to be switched on/off with my upfitter switches. Now the wiring setup that comes with these lights have standard 30/85/86/87 relays. I think these are 15amp relays? Now the upfitters are already equipped with relays correct? Aux 1 and Aux2 are 30 amp relays correct? Now should I still use the wiring setup that came with these lights, or would it be silly using "two" relays in one line? Can I run all four lights off of one 30amp upfitter switch? Would there be any issues with that? Should I just wire the lights directly to the upfitters? I want to make this as painless as possible and have the least amount of "extra" wires under the hood.
Any and all help is appreciated. A lot of beer is consumed when I do electrical projects.
First off, I don't know for sure if the upfitter switches have a relay doesn't matter if its rated for 30 amps, and am not sure about the ampacity of the switches...If switch 1 and 2 are fused at 30 amps...You should be more than fine to run all 4 lights off of one switch...
lights that means that each of the 4 lights draws 4.58amps at 12 Vdc
...b/c...watts=volts * amps...so we know the voltage is 12volts and we know the wattage is 55 per light so divide 55 by 12, and that gives you 4.58.
So, all 4 lights together draw a total of 18.3 amps
...Now, you never want to run something fully loaded...meaning that you would not want to put something that draws the full 30 amps, just becuase you are fused for that, you could but it is asking for trouble...
But you are fine...Because if you are fused for 30 amps on your upfitter switches and you are putting a total load of 18.3 amps on it you are only at 61% of full load on the circuit so you are good.
Let me say this about the relay...I would not use them if your upfitter is rated for 30 amps...I am almost fure the reason they gave you the relays is that most trucks do not have these heavy duty upfitter switches that we have, so the relays allow you to use a small toggle switch to turn the lights on by running a hot wire to the toggle switch and then from the toggle switch to the coil of the relay, and then take power straight from the battery to Normally Open contacts on the relay, so when you turn on your toggle switch the relay coil energizes and in turn cause contact closure on the relay and puts 12 volts to your Big Lights...
If you are still unsure about any of this, please let me know and I can explain it in more detail...I want to make sure you understand what I mean, and I may not have been as clear as I should be...
Hope this helps, and feel free to give me a shout if you have anymore questions..