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Topic: what is the relay thingy I disconnected? (Read 933 times) |
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philgood
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2.9l 12v Auto (95 M) Ultima Saloon (Aubergine)
 
Posts: 122
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what is the relay thingy I disconnected?
« on: Mar 20th, 2008, 10:46pm » |
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Following a previous problem with my brake lights staying on, which magically cured it’s self has now returned.
To cut long story short I disconnected a Blue relay thingy, which sits on top of drivers side inner wing, in the engine bay, which cured the problem while on the road, but I don’t know what this unit is for.
My main question is what is the relay thingy that I disconnected?
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Regards
Phil.
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pete from Hull
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Non Scorpio at the moment, but still interested...
Posts: 1365
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Re: what is the relay thingy I disconnected?
« Reply #1 on: Mar 20th, 2008, 11:54pm » |
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Hi Phil
I don't know off hand what the relay you disconnected is for without looking but usually brakelight problems can be tracked down to the switch unit mounted on or under the brake pedal, usually it just needs an adjustment. It may be that your disconnecting the relay was co-incidental to the brakelight working again.  characteristic of an intermittent fault.
I would be inclined to reconnect the relay in case it has stopped something else working.  I'll have a look at mine tommorow and see if I can find out what it is.
hth
Pete
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philgood
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2.9l 12v Auto (95 M) Ultima Saloon (Aubergine)
Posts: 122
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Re: what is the relay thingy I disconnected?
« Reply #2 on: Mar 21st, 2008, 1:47am » |
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I don’t think that the brake pedal switch is at fault, as when I operate the switch it makes the brake light go brighter and dim slightly when released, this would prove the switch is operating correctly and that something else is giving the lights a feed at a lower voltage/amperage!!!
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Phil.
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gozz
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Re: what is the relay thingy I disconnected?
« Reply #3 on: Mar 21st, 2008, 10:27am » |
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phil.
None of my cars has a blue thingey,it may be retrofit.Have you tried removing a wire from your brakelight switch?If the light extinguish then you've cracked it.It is possible for different intensities of light to prevail according to whether or not the switch is properly engaged.
GOZZ
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scorpio_man
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Ford Kuga awd
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Re: what is the relay thingy I disconnected?
« Reply #4 on: Mar 21st, 2008, 10:57am » |
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on Mar 20th, 2008, 10:46pm, philgood wrote:To cut long story short I disconnected a Blue relay thingy, which sits on top of drivers side inner wing, in the engine bay,
My main question is what is the relay thingy that I disconnected?
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hi there
the only relay i know of is the BIG green one for the front engine fans.
hth
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philgood
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2.9l 12v Auto (95 M) Ultima Saloon (Aubergine)
Posts: 122
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Re: what is the relay thingy I disconnected?
« Reply #5 on: Mar 21st, 2008, 12:22pm » |
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My mistake.
In the dark it looked blue but it is in fact a greenie colour unit! About 3” long & about 1 ½” square; I presume it’s the one you say should be on front of the fans. What is this for?
Regards
Phil
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Phil.
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Jonnycab
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Former owner of 2.3 Ultima Facelift saloon
Posts: 3900
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Re: what is the relay thingy I disconnected?
« Reply #6 on: Mar 21st, 2008, 12:28pm » |
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The big green relay controls the fans 
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philgood
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2.9l 12v Auto (95 M) Ultima Saloon (Aubergine)
Posts: 122
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Re: what is the relay thingy I disconnected?
« Reply #7 on: Mar 21st, 2008, 4:38pm » |
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Best I plug it back in I suppose!
So how does unplugging this relay make my brake lights operate correctly?
I have previously checked the pedal switch and boot lid looms for damage, and I disconnected what I think is the cruise control relay in the glove compartment (middle relay) when the fault reoccurred but this made no difference so I reinstalled this relay. What else is in the brake light circuit?
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Phil.
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philgood
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2.9l 12v Auto (95 M) Ultima Saloon (Aubergine)
Posts: 122
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Re: what is the relay thingy I disconnected?
« Reply #8 on: Mar 21st, 2008, 6:15pm » |
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I’ve put all back as it was and now every things working correctly again The gremlins are at work here  .
My question still stands;
What is in the brake light circuit that could cause this fault? My original thought was a feed from the cruise control, as this should cut out when the pedal is depressed but obviously when my brake lights are on I can’t engage the cruise control!
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Phil.
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pete from Hull
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Re: what is the relay thingy I disconnected?
« Reply #9 on: Mar 22nd, 2008, 1:08am » |
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Electrical Gremlins can be caused by water in the fusebox which will give different problems. It is worth checking the two fuseboxes and the area nder the passenger side footwell for damp. A well known problem on this site...
Hth
Pete
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philgood
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2.9l 12v Auto (95 M) Ultima Saloon (Aubergine)
Posts: 122
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Re: what is the relay thingy I disconnected?
« Reply #10 on: Mar 23rd, 2008, 8:56pm » |
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fuse box ok I've checked several times
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Phil.
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harry.m1byt
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What's YaBB?
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Re: what is the relay thingy I disconnected?
« Reply #11 on: Mar 24th, 2008, 1:40pm » |
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The cruise control is located drivers side(right) above the drivers right leg. Drop down the soft panel and it sits on a tray up there.
Have you checked for a possible fault in the harness which runs along the boot hinge?
See if the brake lights go out when you disconnect the feed to the brake light switch, there might be a partial short inside the switch.
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gozz
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Re: what is the relay thingy I disconnected?
« Reply #12 on: Mar 24th, 2008, 5:05pm » |
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phil.
The brake light loom does'nt go via the bootlid,the lights are in the back of the rear wings.
GOZZ
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Simmo
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I'm an OAP !
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Re: what is the relay thingy I disconnected?
« Reply #13 on: Mar 25th, 2008, 7:16am » |
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Gozz. I think what Harry is saying is to check the loom where it enters the boot area behind the offside hinge. There is a known problem with the loom coming into contact with the hinge if it is not held securely back out of the way. We did have some photos of this at one time and the damage is often 'hidden' in that you need to remove the outer 'wrapping' to actually check the loom wires.
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gozz
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Re: what is the relay thingy I disconnected?
« Reply #14 on: Mar 25th, 2008, 7:08pm » |
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AYE AYE Simmo.
I'm with you now,Ithought he was referring to the looms in the hinges.
GOZZ
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