12-26-2012, 12:11 PM
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#1
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Quick electrical question
I currently have two of the 35 watt HID (Kragen style-red outer ring) lights on my roof rack. Could I run 4 35 watt HIDs through the same 30 AMP relay? I'd like to splice the other to lights into the same wires going roof so I don't need to run anymore through the headliner. Does that make sense; haven't had any coffee yet and my 10 month old has a cold so sleep deprevation is making me a zombie. 
thanks
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93 Hilux Surf, 3.0 kz-te, restoration in 3, 2, 1
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12-26-2012, 01:02 PM
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#2
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Location: Odessa/Midland TX
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Equation to calculate the amps is W = VxI. W = watts, V = volts and I = amps. With a 30 amp relay you can take out W = 12 X 30 = 360 watts of power. If you are using a regular cubic relay (non OEM denso), I recommend, do not run max amps. With two 100 W halogen lamps, a 30 A relay (non OEM) got roasted!
Same here with my daughter!
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12-26-2012, 01:37 PM
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#3
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you can calculate max amperage draw by taking the total wattage (so, if you mean 4 total 35w lights, you will have 140w draw) and dividing it by the lowest voltage your battery will see. (the lower the voltage, the higher the draw). in this case I used 12v.
140w/12v=11.6 amps. so, yes. it's fine. wire in series-parallel. you have one big wire for all four providing power, and then tap into it for each light.
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 '94 SR5 V6, 2" body lift, 4.56 gears, 31x10.50-15, Hella 500's (needs less stock!)
Quote:
Originally Posted by KidVermicious
I wouldn't be opposed. With another kid on the way, four doors is looking more and more attractive.
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12-26-2012, 07:30 PM
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#4
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Join Date: Jun 2010
Location: Vancouver, BC
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Quote:
Originally Posted by mikebontoft
you can calculate max amperage draw by taking the total wattage (so, if you mean 4 total 35w lights, you will have 140w draw) and dividing it by the lowest voltage your battery will see. (the lower the voltage, the higher the draw). in this case I used 12v.
140w/12v=11.6 amps. so, yes. it's fine. wire in series-parallel. you have one big wire for all four providing power, and then tap into it for each light.
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X2. I run 3) 100W Halogens off a single 30A Bosch relay with no issues.
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SOLD!99 SR5 V6 - SS 1.2 Lift, 1" BL, 231mm TBU, LTX M/S2s, Savage Sliders, Skids and Bumpers, Lots of LEDs, 70266 ATF Cooler with 5757 Gauge, Homemade Roof Rack, VHF & CBs, Various Off-Road Goodies '10 Trail Edition - WeatherBeaters, VentShades, Prodigy P3, TruCool 4589 ATF Cooler, E Rated LTX M/S2s, Booster Seats with a hint of kid puke '16 Tundra TRD SR5 - ATC Cap, AirLift Bags and WirelessAir Controller, Prodigy P3, LineX, E Rated Defender LTXs
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12-27-2012, 02:22 AM
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#5
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^^that is cutting it close though... about a 25a max draw.
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'94 SR5 V6, 2" body lift, 4.56 gears, 31x10.50-15, Hella 500's (needs less stock!)
Quote:
Originally Posted by KidVermicious
I wouldn't be opposed. With another kid on the way, four doors is looking more and more attractive.
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12-27-2012, 02:34 AM
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#6
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Don't HIDs pull more though when they are first fired?
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12-27-2012, 02:44 AM
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#7
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Quote:
Originally Posted by mikebontoft
^^that is cutting it close though... about a 25a max draw.
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Yeah, the Bosch relay will run 30A all day but I just scabbed it in to make a trip in time.... 5 months ago... Got a switch from OTRATTW sitting on the bench and a 40A relay just for peace of mind. Just need the time to get her done.
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SOLD!99 SR5 V6 - SS 1.2 Lift, 1" BL, 231mm TBU, LTX M/S2s, Savage Sliders, Skids and Bumpers, Lots of LEDs, 70266 ATF Cooler with 5757 Gauge, Homemade Roof Rack, VHF & CBs, Various Off-Road Goodies '10 Trail Edition - WeatherBeaters, VentShades, Prodigy P3, TruCool 4589 ATF Cooler, E Rated LTX M/S2s, Booster Seats with a hint of kid puke '16 Tundra TRD SR5 - ATC Cap, AirLift Bags and WirelessAir Controller, Prodigy P3, LineX, E Rated Defender LTXs
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