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Headlight Voltage

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Old Aug 17, 2009 | 12:18 AM
  #1  
seanf's Avatar
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Model: Cherokee
Default Headlight Voltage

I just added some driving lights that I wanted to turn on when the high beams are on. I tapped in to the high beam wire at the plug where it plugs in to the headlight. I got out the multi-meter to make sure I had the correct wire for the high beams. When I tested the wire it was 10 volts at the plug. At first I thought maybe my battery was low. I checked the voltage at the battery and it was about 12.5 . Does anyone know if the voltage is intentionally stepped down to the headlights or do I have some bad wiring somewhere?

I checked the voltage of the 40 amp fuse for the headlights under the hood and it was 12.5 volts.

sean
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Old Aug 17, 2009 | 12:20 AM
  #2  
93XJLI's Avatar
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From: LI, NY
Year: 1998
Model: Cherokee
Engine: 4.0, bolt ons for days...
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the wires are just really ****ty. i have this harness in my XJ and my RS and its great

http://www.eautoworks.com/product-eA...com-189849.htm

makes a big difference
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Old Aug 17, 2009 | 05:32 AM
  #3  
TheBlackWidow's Avatar
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Year: 2000
Model: Cherokee
Engine: 4.0
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Originally Posted by seanf
I just added some driving lights that I wanted to turn on when the high beams are on. I tapped in to the high beam wire at the plug where it plugs in to the headlight. I got out the multi-meter to make sure I had the correct wire for the high beams. When I tested the wire it was 10 volts at the plug. At first I thought maybe my battery was low. I checked the voltage at the battery and it was about 12.5 . Does anyone know if the voltage is intentionally stepped down to the headlights or do I have some bad wiring somewhere?

I checked the voltage of the 40 amp fuse for the headlights under the hood and it was 12.5 volts.

sean
I would not suggest putting fog lights on the headlight wireing. I know its the easiest way to do it. But i would run it on a seperate switch with a relay. I have two hella lights that are hooked up in place of my old factory lights. Not done by me but previous owner. When i bought it the headlights would cut out on their own at night. So did the fog lights and the dash lights. Everything would flicker. I pull the healight switch out and it is hotter than a fire cracker. So I figure it was a faulty switch. So i go to a Junk yard and buy another switch for 35 bucks. 24 hours later it started with one fog light going out. When inspecting that light the other fog light went out. I go to look at the switch and all my dash lights are out and then finally my damn runing lights on the back. I have brake lights but the dont light up unless im hitting the brakes.

I feel the switch again and of course its hotter than a firecracker. So im gonna run the fog lights on a seperate circuit in hopes that it was drawing to much amperage and frying the switch. I pray. Cause if that aint the problem then I have no Fing clue.
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Old Sep 10, 2009 | 01:09 PM
  #4  
19558077's Avatar
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From: W.V.
Year: 2000
Model: Cherokee
Engine: 4.0 I6
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Originally Posted by 93XJLI
the wires are just really ****ty. i have this harness in my XJ and my RS and its great

http://www.eautoworks.com/product-eA...com-189849.htm

makes a big difference
thats a good idea. but i dont see one for the stock 6054 bulb?
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