Birty Dastards Jeep Club

Tech Forum => Workshop => Topic started by: steve.wickes on January 26, 2007, 08:57:05 PM

Title: Headlight Relay
Post by: steve.wickes on January 26, 2007, 08:57:05 PM
Does anyone know where the headlight relay is located on a 1993 XJ. I have a feeling that it is in the relay box under the dash to the left of the steering column, but I don't know which one it is.

Got no headlights at the moment s a swift reply would be appreciated
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Post by: tim_aka_tim on January 26, 2007, 09:15:27 PM
Can't find a relay on the wiring diagrams. Could be the switch (they're shit), or Fuse 5 under the bonnet in the power distribution centre 40 amp, orange.
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Post by: steve.wickes on January 26, 2007, 09:18:38 PM
I have put a new switch on today and the problem is still there. Main beam works on the column, but will not lock on. Headlights come on occassionaly and I can hear a clicking under the dash.

This problem started with the headlights flashing on and off whilst driving.
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Post by: tim_aka_tim on January 26, 2007, 09:44:04 PM
Certainly sounds like a relay, but I'm buggered if I can find it! Sorry mate.
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Post by: tim_aka_tim on January 26, 2007, 09:59:01 PM
OK, try this (http://http://www.dua1.com/AdminFiles/Jeep/93/control_module_units.pdf) PDF. Evidence suggests that the culprit might be the headlight delay module (a glorified relay), which on a LHD is near the headlight switch.
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Post by: greggmo on January 26, 2007, 10:17:04 PM
ahh who needs lights when ya got night vision scopes 8)  i hate lecky troubles, they are a pain in the ass :(
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Post by: Dave69 on January 27, 2007, 07:31:55 AM
swapped the origional switch on mine as it was suspect, nice to see they were made out of bakalite. the new replacements are now a resin plastic mix, didn't realise there was a relay as well near to it. If i alter the dimmer switch from full on to variable the fuse blows so i suspect something else but with such a limited space in there i'll be dammed if i'm looking for the problem just yet
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Post by: Invicta on February 10, 2007, 10:11:08 PM
Came back from Evesham tonight - first trip out in the dark in my Mitsubishi J20. Switched on windscreen smearers and the headlights went out - just as we approached a roundabout. - Made my long suffering girlfriend sit-up and comment on my excellant (?) taste in transportation! Bernard
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Post by: chrisjones on February 10, 2007, 10:12:22 PM
Ahh Jeeps!............don't ya just luv um? :D
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Post by: MK1 on February 10, 2007, 10:15:55 PM
Quote from: "Invicta"
.......Switched on windscreen smearers and the headlights went out


Was that an optional extra on Mitsys?
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Post by: Dave69 on February 11, 2007, 06:19:55 PM
is the relay of a std make or is it specific to jeep ?, mine has started to flash the headlamps after 1/2 hr of being switched on
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Post by: steve.wickes on February 11, 2007, 10:18:51 PM
There is not a headlight relay. Further investigation with mine has found that the connector on the top of the headlight switch is getting hot. Mine also lasts about 1/2 an hour before the problem starts. I am thinking of putting higher amperage connectors on the switch.

Put your hand up under the dash and feel the top of the headlight switch.
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Post by: Bubba on February 11, 2007, 11:08:16 PM
do you have any spots on it
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Post by: Mike Pavelin on February 11, 2007, 11:14:38 PM
That's standard. The switch and connections often overheat. To stop it happening, replace the switch and connectors as necessary and then rewire after the swith with a relay to take the load off it.
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Post by: Dave69 on February 12, 2007, 07:40:51 AM
might be the connections as the switch is new, does anyone have a relevant wiring diagram, for the terminal connections so to make things easy. the haynes might be a bit vague or is it safe to copy from it ?
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Post by: steve.wickes on February 12, 2007, 08:52:29 PM
Quote from: "Mike Pavelin"
That's standard. The switch and connections often overheat. To stop it happening, replace the switch and connectors as necessary and then rewire after the swith with a relay to take the load off it.


Do you happen to know which terminal(s) the headlight load is on Mike?
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Post by: Dave69 on February 13, 2007, 07:53:53 AM
without looking at the wiring diagram i am assuming there is only one 12v supply to the switch. using a 4 pin latching relay (same type used for spot lamps) one circuit is connected to a switched supply (ignition) and the othe makes the connection from the 12v supply to the switch