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Topic: testing a relay (Read 894 times) |
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ren
Full Member
95 N 2.9 24v Cossie Estate
Posts: 480
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testing a relay
« on: Mar 12th, 2008, 9:06pm » |
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can a relay be tested if so how
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gozz
Senior Member
Been around awhile
Posts: 3475
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Re: testing a relay
« Reply #1 on: Mar 12th, 2008, 9:30pm » |
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A simple relay is an electromagnetic switch whereby the main circuit is closed by a primary circuit.Many relays have a schematic diagram on them depicting the way round they are connected.If it is just a four pin unit connecting the power to the magnet will produce a click as the solenoid pulls in,the other two pins will now be connected to the appliance,rig up a battery and test light or meter and do circuit tests.If the unit is multi pin you really need a diagram.
GOZZ
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TiberiuS
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Ex. 1996 2.3 Ultima - RIP P789 KHJ
Posts: 2257
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Re: testing a relay
« Reply #2 on: Mar 12th, 2008, 11:04pm » |
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Yeah, you can check the coil terminals with a multimeter or just put power to the coil and test for continuity accross the contacts. Ideally you want to check that there's no voltage drop accross the contacts, sometimes if the contacts get burnt or dirty you get a voltage drop which creates heat which kills the relay and causes problems elsewhere because the voltage is lower than it should be.
If it's an intermittent fault you're chasing then don't bother, just drop in another relay. Sometimes they go bad like that and you'll tear your hair out trying to find the fault.
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Jonnycab
Senior Member
Former owner of 2.3 Ultima Facelift saloon
Posts: 3900
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Re: testing a relay
« Reply #3 on: Mar 12th, 2008, 11:16pm » |
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Or a quick trip down the breakers & walking out empty handed....apart from a pocket full of relays....is a cheap, non technical option 
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ren
Full Member
95 N 2.9 24v Cossie Estate
Posts: 480
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Re: testing a relay
« Reply #4 on: Mar 12th, 2008, 11:41pm » |
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a forum member as sent me one, but its
giveing me the same as my own,thats why
i asked about if they can be tested.
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Jonnycab
Senior Member
Former owner of 2.3 Ultima Facelift saloon
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Re: testing a relay
« Reply #5 on: Mar 13th, 2008, 12:06am » |
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What relay is it that you're having trouble with Ren ?
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ren
Full Member
95 N 2.9 24v Cossie Estate
Posts: 480
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Re: testing a relay
« Reply #6 on: Mar 13th, 2008, 3:06pm » |
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front heated screen relay R18
the control light in the switch doesnt illuminate
have replaced the fuses
have replaced the switch
and changed the relay still no illumination of switch
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pete from Hull
Senior Member
Non Scorpio at the moment, but still interested...
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Re: testing a relay
« Reply #7 on: Mar 13th, 2008, 3:28pm » |
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on Mar 12th, 2008, 11:16pm, jonnycab wrote:| Or a quick trip down the breakers & walking out empty handed....apart from a pocket full of relays....is a cheap, non technical option |
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JC you know there is no one on this forum who would dream of doing such a thing..... That would be naughty  I am surprised at you.....
Pete
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gozz
Senior Member
Been around awhile
Posts: 3475
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Re: testing a relay
« Reply #8 on: Mar 13th, 2008, 11:02pm » |
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ren.
Is the heated screen heating,can you hear the relay when you press the switch ?
The switch lamp failing to illuminate is common,and need'nt mean failure of the system.
jonnycab.
Your local nosey inspectorate of scrapyard pocketers is on to you !
GOZZ.
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Snoopy
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Very old.BAD tempered and missing friends.
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Re: testing a relay
« Reply #9 on: Mar 14th, 2008, 7:59am » |
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Check the earth straps either side of the front screen, they are open to the elements and suffer from oxidisation .
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Jonnycab
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Former owner of 2.3 Ultima Facelift saloon
Posts: 3900
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Re: testing a relay
« Reply #10 on: Mar 14th, 2008, 11:46am » |
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"Or a quick trip down the breakers & walking out empty handed....apart from a pocket full of relays....is a cheap, non technical option".......
Sorry about that, I don't know what I was thinking..... I certainly wouldn't dream of doing anything like that....honest ...... 
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ren
Full Member
95 N 2.9 24v Cossie Estate
Posts: 480
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Re: testing a relay
« Reply #11 on: Mar 14th, 2008, 9:36pm » |
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Snoopy
Where are the straps located,you say either
side of screen,is there a pic showing the location.
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Simmo
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Re: testing a relay
« Reply #12 on: Mar 15th, 2008, 6:17am » |
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Have a look at THIS page. You need to remove this grille in order to access the connectors. If you look at the third picture the connection is just about where the left hand arrow is pointing. There is another one on the opposite side.
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ren
Full Member
95 N 2.9 24v Cossie Estate
Posts: 480
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Re: testing a relay
« Reply #13 on: Mar 15th, 2008, 9:06am » |
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Simmo
Thanks for the info,wasnt sure if i had to
remove the rubber seal to get to them, so
happy i havnt,will have a look tommorow.
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Snoopy
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Re: testing a relay
« Reply #14 on: Mar 15th, 2008, 9:31am » |
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Ren they should be visible without removing any trim ..... MINE are. I will post a picture later if it helps ...
they should be located either side of the widscreen .. visible when the front bonnet ( hood ) is lifted ..
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ren
Full Member
95 N 2.9 24v Cossie Estate
Posts: 480
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Re: testing a relay
« Reply #16 on: Mar 16th, 2008, 12:32pm » |
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yes i could only locate the feed connectors
so i cleaned them up and now have illumination
of the switch,got to wait now for a frosty morning
to see if the screen heater works.
Snoopy thanks for pointing me towards the connectors.
Thanks for all the replys everyone
ren
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