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Topic: Headlights stuck on (Read 2455 times) |
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wolfblood
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Headlights stuck on
« on: Jan 11th, 2011, 7:12pm » |
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Hi all. Got back to the car after work to go home and the battery was dead. Luckilly a workmate gave me a jumpstart which is when I noticed the headlights were stuck on. All the other lights rear dash etc switch off with the knob but the headlights just stay on even when keys removed. Drove home fine & have disconnected the bulbs for the night to see if it was this circuit that drained battery but confused.
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Highlander
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13 Scorpios, XR4x4, Suzuki SJ413 for off road :)
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Re: Headlights stuck on
« Reply #1 on: Jan 11th, 2011, 7:28pm » |
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Check the back of the headlight switch, they are known to burn out and melt around the terminals
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on Oct 17th, 2011, 12:35pm, Simmo wrote:I give up !  Too much for an old boy!  |
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Scorpio_Mike
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Re: Headlights stuck on
« Reply #2 on: Jan 11th, 2011, 10:07pm » |
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If you need a replacement headlight switch don't forget there are 2 different types for with or without front foglamps 
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Star sign is Scorpio !
Sierra XR4i's are great...especially when fitted with 4WD 
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wolfblood
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Re: Headlights stuck on
« Reply #3 on: Jan 12th, 2011, 8:06am » |
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tried to start car this morning & battery flat. I disconnected light bulbs last night as thought this would kill the flow through this circuit? Would a faulty switch drain battery when lights disconnected? Cheers
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martin_rowe
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Re: Headlights stuck on
« Reply #4 on: Jan 12th, 2011, 9:13am » |
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check fuse boxs, & fag lighter wiring.
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Rally Drivers Do It Sideways
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Cosray
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8th Scorpio, 2nd Cosworth: currently '95
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Re: Headlights stuck on
« Reply #5 on: Jan 12th, 2011, 4:09pm » |
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Hi Wolf B
Headlamps are relay-driven for main and dip directly from the PLUS.
Either relaycontacts are probably sticking or welded together because of time and current.
Relay K37 & 36
See here: http://www.bitly.nl/703855
HTH
Ray
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Simmo
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Re: Headlights stuck on
« Reply #6 on: Jan 12th, 2011, 4:28pm » |
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The relays are numbers 3 and 6 in the main,drivers side, fusebox.
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wolfblood
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Re: Headlights stuck on
« Reply #7 on: Jan 12th, 2011, 8:43pm » |
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Thanks everyone.
Got home tonight and removed headlight switch. All looked OK so took it apart. (Tip if taking apart do so in a box to catch springs & ball bearings). All contacts looked OK so gave a clean & put back together. Got a jump start & switch was working fine lights turned on & of OK. Took car for a spin to charge battery. Have parked up for night but still not confident that I have found the drain on battery so have removed switch & the two relays from main fuse box & will see what happens in the morning.
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wolfblood
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Re: Headlights stuck on
« Reply #8 on: Jan 13th, 2011, 8:53am » |
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Morning all.
Got to the car this morning turned key and battery looked good so connected everything back up and started car.
Turned lights on & off OK and kept at tick over for a while. Then lights stuck on again. Removed switch lights still on so put switch back & moved to relays in main fuse box. With switch in the off position removed relay at R3 & lights turned off. Put it back lights came on. Turned rest of lights on & drove to work. When got there turned light switch off & all lights turned off properly. Have removed relays again til finish work so can see effect on battery. Fingers crossed.
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Cosray
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Re: Headlights stuck on
« Reply #9 on: Jan 13th, 2011, 9:02am » |
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... stuck on in DIP or MAIN?
Or either?
Or both?
You might change both relays round and observe pattern.
Ray
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martin_rowe
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Re: Headlights stuck on
« Reply #10 on: Jan 13th, 2011, 9:49am » |
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fuse box
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Cosray
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8th Scorpio, 2nd Cosworth: currently '95
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Re: Headlights stuck on
« Reply #11 on: Jan 13th, 2011, 10:31am » |
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on Jan 13th, 2011, 9:49am, martin_rowe wrote:
eehhh?
Ray
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wolfblood
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Re: Headlights stuck on
« Reply #12 on: Jan 13th, 2011, 12:14pm » |
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Thanks for feedback everyone.
Ray it was stuck on in dipped beam. Main beam could flash on/off as normal at all points.
Have taken the relay to work and checked it with a multimeter for resistance.
Reading of 79.4 across terminals 85 & 86 read a steady 1 on all other configurations.
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martin_rowe
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Re: Headlights stuck on
« Reply #13 on: Jan 13th, 2011, 1:34pm » |
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short in fuse box triggers relays (water ingress/corrosion)
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Cosray
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Re: Headlights stuck on
« Reply #14 on: Jan 13th, 2011, 3:36pm » |
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on Jan 13th, 2011, 12:14pm, wolfblood wrote:Thanks for feedback everyone.
Ray it was stuck on in dipped beam. Main beam could flash on/off as normal at all points.
Have taken the relay to work and checked it with a multimeter for resistance.
Reading of 79.4 across terminals 85 & 86 read a steady 1 on all other configurations. |
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Ahhhh that might be your problem there... 86 - 85 > 80 Ohms id fine, that's the coil's resistance allowing for 150mA when active.
When NOT activated/energized 30 & 87 should read infinite/OPEN, not 1.
1 / one / Ohm means stuck & closed so always ON.
Are you sure you had your Voltmeter on very very low Ohms range?
HTH
Ray
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wolfblood
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Re: Headlights stuck on
« Reply #15 on: Jan 13th, 2011, 4:24pm » |
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Cheers for feedback.
Was using multimeter from one of our computer guys at work. Lowest setting was up to 200 ohms. Multimeter was showing a reading of 1 even when probes not touching anything (have just checked).
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Cosray
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Re: Headlights stuck on
« Reply #16 on: Jan 13th, 2011, 4:41pm » |
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on Jan 13th, 2011, 4:24pm, wolfblood wrote:Cheers for feedback.
Was using multimeter from one of our computer guys at work. Lowest setting was up to 200 ohms. Multimeter was showing a reading of 1 even when probes not touching anything (have just checked). |
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Pity, incomplete data arrrgghhh
Best test is pulling both relays, multimeter on 200 Ohms range and apply 12V on 85 & 86 ON/OFF repeatedly on each happily clicking away.
Your computer guys should have a 12V powersupply or even 2 or 3 x 4.5V batteries in series. Should read 0-1 Ohms max. depending on meterquality between pin 30 & 87.
Relays are easy to open for visual contact inspection, just prise the bottom out of the casing with a flat thin knife.
If both are good then we must proceed to other circuitry but first things first.
HTH
Ray
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wolfblood
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Re: Headlights stuck on
« Reply #17 on: Jan 16th, 2011, 8:03pm » |
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Hi everyone
Have been swapping relays with intermittent results.
Sometimes the headlights stay on sometimes they don't when switch is off. If the lights are already on then swapping the relay for a different one of the same type keeps them on.
Looks like a fusebox then I suspect. As it is constantly raining either lightly or heavy at the moment suspect that moisture in the box could be the culprit as has been suggested & don't want to swap one until I can do it in the dry.
Will have to keep removing the relays when parking until next weekend I suppose. Weather permitting.
Regards
Dean
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Cosray
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8th Scorpio, 2nd Cosworth: currently '95
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Re: Headlights stuck on
« Reply #18 on: Jan 17th, 2011, 9:18am » |
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... does your car have a daylight dip lamp function? That might point to a clue.
Curious
Ray
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wolfblood
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Re: Headlights stuck on
« Reply #19 on: Jan 17th, 2011, 11:18am » |
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Hi Ray
Not that I am aware what would it look like?
As a side note this morning when I went to the car the side and rear hazards were flashing although they were not switched on.
I know they flash sometimes when I lock the doors faster than when they are on for a hazard and they did seem to be flashing faster than just as hazards.
Cheers
Dean
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