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Unread 11-29-2011, 08:31 AM   #1
rockcop
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Light wiring question?

Before I get flamed, I've searched and can't find the answer to my question. I have two auxiliary lights on my front bumper that were installed by the PO with no switch that I can find. I want to rewire with a switch on the dash. I only want to turn the lights on manually. Can I wire these lights straight to the battery and through a switch? Do I need relays and a inline fuse? Any recommendations is appreciated.

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Unread 11-29-2011, 08:35 AM   #2
loukimball
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yes, I have mine that way, I used inline fuse, I mounted a switch under dash...if you run more than 2 u Prolly need to do relays and go through fuse box...

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Unread 11-29-2011, 08:36 AM   #3
tdewit
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Here's a good write-up with diagrams.

http://www.google.com/imgres?imgurl=...ed=0CBkQ9QEwAQ
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Unread 11-29-2011, 09:53 AM   #4
Old4X
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Relay use depends on wattage of the lights. If high output, use a relay.

ALWAYS fuse EVERY accessory!
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Unread 11-29-2011, 11:58 AM   #5
Billsbluejeep
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Always use a fuse... period!

...and you might as well wire it up with relays too, that way when you modify or replace the lights you won't need to go back and retrofit your wiring too.

Here's a good write-up for doing it right; http://www.jeepforum.com/forum/f20/w...ations-378268/
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Unread 11-29-2011, 12:05 PM   #6
timatoe
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Can you? Yes. Would I? No.

What I did was get a relatively cheap fuse block that is fed from the battery and then every accessory is fed from there through a relay. It's not expensive or difficult to do.

This is what mine looks like. I know it's a mess, I plan on cleaning it all up a bit when I do the new fenders etc. this winter....

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Unread 11-29-2011, 12:18 PM   #7
Shenandoah
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Some states require the lights wired to come on with the low/high beams. Check your state laws (for on road use).

I would recommend relay(s) and always fuse. I bought some black, plastic boxes from Radio Shack. In line fuses were put inside one box and relays were put in the other box. Boxes are marked and harnesses are run between them.

Timatoe has the same idea, mine is less high tech.
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Unread 11-29-2011, 01:06 PM   #8
Xpress
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^Link to list of these laws? The only laws I have heard is that if they are accessory offroad lights that they need to be covered up while on the road.
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Unread 11-29-2011, 02:34 PM   #9
Berniebikes
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Sometimes lights require much more amperage (hence bigger wire, more power) than tyical switches are usually made to handle. Rather than run from the battery into the cab, thru a switch and back out to a light you use a relay. It only takes a very low current to run the relay, so your relay switch leg goes from the cab and thru the relay. That way your higher power wire is confined and you don't overload your switch. As others said, also use a fuse to prevent melting things! Whether inline, or thru a fuse block doesn't really matter, just protect it. If you need assistance on how to do it the link above has all the info you need!
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Unread 11-29-2011, 02:51 PM   #10
timatoe
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Quote:
Originally Posted by Xpress View Post
^Link to list of these laws? The only laws I have heard is that if they are accessory offroad lights that they need to be covered up while on the road.
I'm unaware of any such wiring law in CA. The way yours are from your avatar pic are fine, anything more than four lights total have to be covered.
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Unread 11-29-2011, 03:17 PM   #11
Matt The Hammer
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The relay eliminates all the power flowing through your switch on the dash. The relay acts like a switch that is controlled by the switch on the dash. It's actually much easier to use the relay as the wiring is much easier to run IMO.
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Unread 11-29-2011, 03:22 PM   #12
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Quote:
Originally Posted by Matt The Hammer View Post
The relay eliminates all the power flowing through your switch on the dash. The relay acts like a switch that is controlled by the switch on the dash. It's actually much easier to use the relay as the wiring is much easier to run IMO.
If you're setting up more than one set of lights, I would suggest a fuse block like Tim has, for power from battery to relays and one hot wire daisy chained to the input of all your switches with cat 5 out to the relays to energize them. It minimizes the birds nest under the hood.
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Unread 11-29-2011, 04:07 PM   #13
Shenandoah
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Don't know about CA law. In Va you can have 4 lights on at a time. Low beam plus another set wired into the low bean and high beam with another set wired to high beam.

Off road lights have to be covered and they can be wired to a separate switch.
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