Relay Question 2

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Edgukated
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Joined: Wed Aug 23, 2006 5:36 pm

Relay Question 2

Post by Edgukated »

OK - I got such a fast response to my first question, I thought I would try my luck with question 2.

I have a box full of relays and I am about to plug them back into the panel. But it might be a good idea to test them first because some look a little beat up.

Can I use my trusty old multimeter to test them? Is so where would I find the specs?

I did look on http://www.cabbyinfo.com but didn't find it which surprised me because they seem to have everything imaginable there.

...timmy
CalAltaDubber
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Post by CalAltaDubber »

That depends on the relay (they are not all created equal)

For general relays, you will need to apply 12V across the the coil (usually terminals marked 15 and ground (I forget the terminal number they use for ground). This will energize the relay.

With the relay energized, you should read a short (0 Ohms) across the switched terminals (usually something like 85, 86, or 87).

Some relays are "Normally Closed" or have terminals that are normally closed, which means that when energized, the reading will be an open (no contact) across those terminals.

Still other relays, like the seat belt warning relay have some other functions included.

Luckily, most relays used by VW have some kind of schematic on them.

My expierence is that relays usually are usually good, however I would suspect the more complicated ones.

Hope this helps.
Phil

'87 Cabriolet, "Topless Bunny"
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Edgukated
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Post by Edgukated »

Thanks Phil,

That got the necessary creative juices flowing. I found a great tutorial on the web
http://www.autoshop101.com/forms/hweb2.pdf
Now I just have to figure out how to test the ones that don't have a diagram printed on them.
...timmy
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Briano1234
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Post by Briano1234 »

Some of the relays have solid state parts, that you can't really rest with a VOM.

But rule of thumb

Use a 9vdc battery to pick the coil then measure it.
then unpic and measure it again. most of the relays that VW uses are in the normally open state.

http://www.ripper1.com/tech/wiring/index.html

is a good place to get the pin layout for BOSCH relays, most of the folks ac/delco and all use the same numbering .
Briano

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kamzcab86
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Re: Relay Question 2

Post by kamzcab86 »

Edgukated wrote:I did look on http://www.cabbyinfo.com but didn't find it which surprised me because they seem to have everything imaginable there.

...timmy
Some things are just better left to the manuals... :wink:
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