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Old 07-25-2010, 09:07 PM   #1
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need driving light help

I bought a jeep with driving lights, and im having some trouble, put a new switch in, that has a led light to tell me that its on. A wire comes from the + side of battery to switch then leaves to lights. negative from battery goes to lights. the switch LED lights up, and from what i can tell the wires have 12.50 volts, but the lights wont light up. If i put the light straight to the battery, then it lights up. cant figure out whats going on?? any thoughts. The switch also has its own ground which is grounded under the dash, but i assume switch is working cause it lights up, and the wires leaving it have voltage?? please advise???

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2003 Wrangler 4.0,Auto,Magnaflow Exhaust, 4" lift,3/4 coil spacers, RC long arms are In,1"BL, 1" M.O.R.E MML,
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4.56 gears are finally in
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Old 07-25-2010, 09:13 PM   #2
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Proper Wiring Schematic

Follow this diagram and you should be good to go:

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Old 07-25-2010, 09:47 PM   #3
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What size (wattage) lights?
If they are higher wattage, ya may have burned the switch up, as it seems you didn't use a relay.
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Old 07-26-2010, 04:27 AM   #4
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relay

where do i get the relay from, and what part # is it?
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2003 Wrangler 4.0,Auto,Magnaflow Exhaust, 4" lift,3/4 coil spacers, RC long arms are In,1"BL, 1" M.O.R.E MML,
Yukon rear axles/lunchbox locker,AA SYE/woody drive shaft, MT MTZ 35"
4.56 gears are finally in
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Old 07-26-2010, 08:12 AM   #5
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you can get a relay at any part store. They are real generic. just get the $12 one form checker/auto zone, I have burned through 2 of the $10 ones for some reason but the $12 one has lasted so far.
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Old 07-26-2010, 08:57 AM   #6
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I use relays for all me aftermarket addons, I just do not trust he OEM wiring since they keep costs down by using the bare minimun when they manufacturer vehciles.
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Retired my 94 YJ 4cyl 5spd @ 200K
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Both as a commuter vehicle in NW, NJ
April 2012.downsized and now a 99er.
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Old 07-26-2010, 08:57 AM   #7
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part #

Could i get a part # for that relay, or what should i tell them at advance auto.
The only thing that bothers me is the power "+" is coming straight from the battery, i didnt go from the fuse box, or under the dash. from the battery to the switch, then from the switch to the lights. The negative from the battery to the lights. I have 12.50 volts to the wiring, the switch lights up, but i cant get the lights to work. if i hook the light straight to a battery, they work, what gives?


thinking about ordering a whole light kit, like hella's or something. Is there any that someone can recommend?
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2003 Wrangler 4.0,Auto,Magnaflow Exhaust, 4" lift,3/4 coil spacers, RC long arms are In,1"BL, 1" M.O.R.E MML,
Yukon rear axles/lunchbox locker,AA SYE/woody drive shaft, MT MTZ 35"
4.56 gears are finally in
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Old 07-26-2010, 09:18 AM   #8
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You burned up your switch...that's what gives, lol.

Multicomp 40A Automotive 12V Relay | ...A) | Multicomp
This is what you need--just see if the parts store carries a basic single pole single throw 12v relay...a 40amp should be fine for a couple driving lights. Make sure it uses a normally open (NO) switch and not normally closed (NC). Their basic relays should already be like that...so if the guy goes, "Huh?" just take what he gives you. lol

Wire the relay as followed...

1.) Battery + to common terminal (get an inline fuse for this run...usually the driving lights come with one...but if they don't, get one and install it here--not sure what size you'd need 15-20A maybe?).
2.) Switched terminal (which will connect to the common terminal when the relay is powered on) to lights
3.) Lights to ground
4.) Battery + to switch
5.) Other side of switch (NOT THE GROUND if it's lighted) to one side of the coil on the relay (if you get a decent relay, the terminals will be marked with a diagram somewhere--doesn't matter which side of the coil you go to)
6.) Other side of the coil to battery -
7a.) If switch is lighted--ground terminal on the switch to a good ground point on the vehicle (I just ran it under the hood to the same ground point as another ground wire so I didn't have to drill another hole).
7b.) If switch is not lighted, you were done at step 6.

Hope this helps some...it looks a lot more complicated while you're doing it, but it's really simple once you finish it.

Btw, you want your lights to run straight from the battery...otherwise they'll burn stuff up. The catch is...and this is where the relay comes in...you DON'T want all that power going through your switch. Using the relay, all the power goes through the relay (which is just a high current switch) and the only power going through the switch is the small amount of power it takes to energize the coil. Also, I tried buying a relay a while back at Autozone and Advance both and neither one here carried the type of relay needed.

If it doesn't look similar to the link I posted above, don't waste your money...you can buy em online for cheap (with cheaper shipping than the one above) all day long.

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