JoelP
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| posted on 26/5/04 at 12:27 PM |
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Relay trouble
this morning i was trying to work out why my side lights are perminantly on, i concluded its the relay that is perminantly closed (switched on). Even
when i completely unplugged it, the needle on the multi meter swung to no resistance, over the switched side. this is obviously not how its meant to
be. So have i buggered it in some way, or is it just a dodgy relay? The fog relay seems to be doing the same thing now...
anyone know whats up?
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stephen_gusterson
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| posted on 26/5/04 at 12:38 PM |
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if its a changover relay, then it will have a common contact and a normall open and normally closed.
you might be connected to the normally closed pin.
whats the numbers on the terminals, and which ones are you connected to?
btw - the coloured case of the relay also denotes the type of contact configuration
atb
steve
[Edited on 26/5/04 by stephen_gusterson]
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JoelP
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| posted on 26/5/04 at 12:49 PM |
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the terminals are numbered 30, 85, 86 and 87, and it has a black case. according to the little diagram on top of it, 85 and 86 control the switch, and
30 and 87 are the ones that take the main current.
does it matter which way i send the currents thru either side?!
[Edited on 26/5/04 by JoelP]
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Bob da builder
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| posted on 26/5/04 at 12:52 PM |
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hey up mate,
im no electrician, i also had the same problem with my air horn! tested it with the meter all seamed fine so i tried a different relay fron the
lights, the horn then worked fine, the strangest bit is that the `knackered` realy from the horn which was for the bin works fine when i put it into
the lighting relay holder!! dont have a clue why but its only a 30sec job to try....
hope it helps
bob
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JoelP
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| posted on 26/5/04 at 01:03 PM |
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god damn these bloody electric contrivances...
cheers for the contributions so far bob and steve, i will head back out in a min to have a fiddle (with the mallet...!)
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JoelP
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| posted on 26/5/04 at 01:35 PM |
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solved it
whats the contact seperation meant to be when its not switched on? having performed some delicate surgery, it seems as if there isnt enough gap
between the two sides of the switch, less than a hairs width. surely it should be more than this? the bit that moves in the magnetic field can go
almost a mm before it hits the coil.
BTW, all three of these relays are now buggered, so its either me doing it wrong or one of the online parts company is supplying duff parts... the two
i got from maplin are still ok.
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stephen_gusterson
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| posted on 26/5/04 at 01:36 PM |
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http://www.crutchfield.com/S-KxN2bfg0mL6/tech/kb326.html
might help
but you seem to have used the correct terminals........
atb
steve
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JoelP
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| posted on 26/5/04 at 01:40 PM |
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good link steve, they imply that polarity matters. is this true? i've been connecting them at random so far!
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Mr G
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| posted on 26/5/04 at 02:42 PM |
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quote:
Originally posted by stephen_gusterson
http://www.crutchfield.com/S-KxN2bfg0mL6/tech/kb326.html
steve
What a lovely name for a site/company... Reminds me of some 70's picture's i've seen
G
[Edited on 26/5/04 by Mr G]
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stephen_gusterson
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| posted on 26/5/04 at 03:21 PM |
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mechnical relays are generally not polarity sensitive.
Certainly not the contacts anyway. You should be able to swap coil wires and contact wires direction without problems on a single pole relay.
Some types (which is why I asked the colour) have internal diodes - usually across the coil to supress interference. Connect these thr wrong way and
you get a short!
Try testing the relay by connecting live power to the coil only - you should hear it click. Also, look to see if you get high resistance at the
contacts with coil off and low resistance with it on.
Or do you have a normally closed (unlikely) relay with reversed operation.
OR - a possibility - have you ever shorted the contacts, which may well have welded them together........
atb
steve
[Edited on 26/5/04 by stephen_gusterson]
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JoelP
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| posted on 26/5/04 at 03:39 PM |
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looks like a bad design to me, the contacts arent welded but they are so close i sometimes cant see between them. they still show a gap on the
multimeter but when i but the cover back on it closes the gap.
i been to maplins to get 3 more, as these ones look much more solid and a bit heavier, plus both work.
inside the old ones it doesnt look too tidy. the contacts arent quite facing eachother like something has bent. sod em...
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Hellfire
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| posted on 26/5/04 at 04:34 PM |
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As long as it's sorted then...
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JoelP
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| posted on 26/5/04 at 05:00 PM |
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yep, all sorted except the fog lights! in fact, might be time for a new thread on fuses and fog lights! so here goes.
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stephen_gusterson
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| posted on 26/5/04 at 06:17 PM |
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wtf did you buy em from maplins for? 
go to any scrappy, get a bag full from a ford for a couple quid!
mr money bags
atb
steve
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JoelP
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| posted on 26/5/04 at 06:44 PM |
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they're only £1.50 at maplins! at least you know they will work well!
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