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Unread 05-29-2009, 09:50 AM   #1
ZJPunk98
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Wiring in Hellas....

Well I just installed my ARB bumper last night and I'm looking to get some hella 500s or 700s to run as some driving lights on the bumper. I would like to run these lights on the factory fog light switch.

What I need to know is if the factory wiring could handle 2 100watt lights or should I used the factory wiring as a switch to a relay and run a power line from the battery to the relay and then the lights.

I think with 2-100watt hellas... running a 40amp fuse and relay, then slitting the source line from the relay to the lights. Is this a good plan? I'll run either 10 or 8 gauge. I think 10g should be fine.

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Unread 05-29-2009, 10:50 AM   #2
besthaticouldo
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use the factory wiring to relay the hellas...i doubt they'll hold 100 watts.
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Unread 05-29-2009, 10:53 AM   #3
YJMCBoy
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I would use 8 ga., 10 is good for 15 amps and you are a little above that with 2-100 watt lights
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Unread 05-29-2009, 11:42 AM   #4
ZJPunk98
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Thanks guys.... I'll use the factory wiring to the relay. I figured that was the best way to go. i'll make sure to use 8ga wiring. Should I be running a 20amp fuse with 40 amp relays? instead of a 40 amp fuse? I'm not sure of the math here. If I knew the formulas.... i would figure it out. Maybe i'll google them.

Also I was just thinking, maybe i should run some rectangle hellas... to match the jeep. I know a lot of people use the round ones, but i figure the zj is fairly sqaure. Your thoughts?
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Unread 05-29-2009, 11:51 AM   #5
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Originally Posted by ZJPunk98 View Post
Also I was just thinking, maybe i should run some rectangle hellas... to match the jeep. I know a lot of people use the round ones, but i figure the zj is fairly sqaure. Your thoughts?

Ick is my opinion. The Hella 500's we ran on the ZJ before it rolled looked great (See avatar) now they are on my WJ awaiting a new cow catcher for her ZJ
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Unread 05-29-2009, 11:58 AM   #6
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Ick is my opinion. The Hella 500's we ran on the ZJ before it rolled looked great (See avatar) now they are on my WJ awaiting a new cow catcher for her ZJ
alright... thanks
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Unread 05-29-2009, 12:07 PM   #7
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(2 x 100W) / 12V = 16.67A

Run a 40A relay and a 20A fuse.
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Unread 05-29-2009, 12:12 PM   #8
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Originally Posted by ZJPunk98 View Post
Thanks guys.... I'll use the factory wiring to the relay. I figured that was the best way to go. i'll make sure to use 8ga wiring. Should I be running a 20amp fuse with 40 amp relays? instead of a 40 amp fuse? I'm not sure of the math here. If I knew the formulas.... i would figure it out. Maybe i'll google them.
Hey man, I would probably use a 20A fuse, the only problem I can think of is if inrush current at initial startup is higher than that you may have nuisance fuse blowing. I am not an electrician but I typically size my fuses for 125% of amp draw (as long as it doesn't exceed wire capabilities) 8 ga wire is good for 24 amps. That being said if the 20A fuses pop due to inrush you can get away with a 25A fuse but don't go any larger than that. If you run 40A relays and 40A fuse and something is wrong with the lights where they start using more current, you have the potential of burning the rig down due to too much current through your conductors. (8 ga) Besides protecting your equipment, you want to protect your wiring too with fuses/breakers.

edit: Bama beat me to it!
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Unread 05-29-2009, 12:38 PM   #9
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Thanks guys. Still planning things out... maybe i'll try and draw my plans up and post them here later so you can all see them and let me know what you think.
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Unread 05-29-2009, 01:02 PM   #10
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Well, at most electronics stores you can by either fast blow or slow blow type fuses. I would recommend a slow blow fuse as it would be a little more forgiving of a transient current like when you turn on the lights. A fast blow fuse will pop the split second it passes 20A. But a 25A fuse would probably work as well.
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Unread 05-29-2009, 01:16 PM   #11
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Originally Posted by Bama_WJ View Post
Well, at most electronics stores you can by either fast blow or slow blow type fuses. I would recommend a slow blow fuse as it would be a little more forgiving of a transient current like when you turn on the lights. A fast blow fuse will pop the split second it passes 20A. But a 25A fuse would probably work as well.
That's a good point to make and a very valid one.
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Unread 05-29-2009, 01:20 PM   #12
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Quote:
Originally Posted by Bama_WJ View Post
Well, at most electronics stores you can by either fast blow or slow blow type fuses. I would recommend a slow blow fuse as it would be a little more forgiving of a transient current like when you turn on the lights. A fast blow fuse will pop the split second it passes 20A. But a 25A fuse would probably work as well.
And I call myself an electronics tech.

Very good point and one I should have thought about long ago.
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Unread 05-30-2009, 08:25 AM   #13
ZJPunk98
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when i cut the factory wiring to remove the fog lamp, should leave the wiring as an open or close circuit? This is pretaining to the one side of the factory wiring which I will not use for the relay.
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Unread 05-30-2009, 10:25 AM   #14
ZJPunk98
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Ok... I need help deciding what lights to get.

I really like these Hella Rallye 4000 Xenons, but they are way to expensive

How about these rallye 4000

or these Optilux 1900s

or just go with the every day 500s or 700s?

The more i look, the more indecisive i get with all the choices. I'm looking for 1 or 2 sets for my ARB bumper, which one set will be used during driving.
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Unread 05-30-2009, 10:43 AM   #15
Mickey_D
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As for the unused wire, there should be a plug somewhere back behind the grille. Just unplug the side you won't be using and zip tie it up out of the way of everything.

As for the lights? I can't really tell you. I've got the 700FF's on the front of mine and love the hell out of them. And I'm using the stock wiring (700FF's are 55W).
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