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914World.com _ 914World Garage _ Relays... stupid question

Posted by: Hammy Nov 10 2005, 06:44 PM

Quick, stupid question. How do the relays on the relay board come out? The little plastic covers pop off but I can't seem to figure out how to get the rest out. I'm asking so i don't screw something up.

Posted by: Mueller Nov 10 2005, 06:46 PM

the relay should come off the board before the cover comes off...sounds like bad corrosion.....

Posted by: r_towle Nov 10 2005, 06:47 PM

grab, wiggle, pull
platic cover stays on the relay

Posted by: Headrage Nov 10 2005, 06:49 PM

When I first got my car I had the same problem. I found out the adhesive that holds the cap on gets brittle and breaks after 30+ years. I just took a utility knife and pried it out of the socket then re-glued the cap back on.

Hope that helps...

Posted by: bd1308 Nov 10 2005, 06:49 PM

some of the seals on those relays suck, so you end up pulling off the over before getting the relay off...

the old ones used a sealer glue to hold the 2 pieces together.

the new ones are much better.

but i typically use a knife to get some leverage and gently work the relay out of the socket.

b

Posted by: Hammy Nov 10 2005, 06:49 PM

peachy.

So how shall I get them off now ?

edit... I'll try and use a knife. I won't get shocked will I

Posted by: Mueller Nov 10 2005, 06:51 PM

QUOTE (Hammy @ Nov 10 2005, 05:49 PM)
peachy.

So how shall I get them off now ?

edit... I'll try and use a knife. I won't get shocked will I

with power off or being carefull, use a small blade screwdriver and pry them off.......

Posted by: bd1308 Nov 10 2005, 06:51 PM

it's all in the plan

nope...as long as your ignition is off.

b

Posted by: Headrage Nov 10 2005, 06:52 PM

QUOTE (Hammy @ Nov 10 2005, 04:49 PM)
I won't get shocked will I

If in doubt, disconnect the battery.

Posted by: Flat VW Nov 10 2005, 06:53 PM

I grab em' with neddlenose pliars on the large pins (same diameter as the leg of the relay that extend up thru the base of the relay.

John

Posted by: Hammy Nov 10 2005, 07:23 PM

Sweet
Turns out it was a bad relay making my heater blower not work

Posted by: SirAndy Nov 10 2005, 07:42 PM

QUOTE (Hammy @ Nov 10 2005, 05:49 PM)
I'll try and use a knife. I won't get shocked will I

how about disconnecting the battery ???

Andy

Posted by: porsche914blue Nov 10 2005, 07:43 PM

These little relays are pretty hardy. This one came out of my car's relay board, and it still worked!!

Attached image(s)

Posted by: Hammy Nov 10 2005, 07:46 PM

Wow.
What do relays do ? how do they work? After looking at my busted one I see the little spring and a plate it connects to and then coil wire underneath that..

Posted by: bd1308 Nov 10 2005, 07:49 PM

guys!!! i got this one:

okay, a relay is a switch. see, a switch can only handle loads up to a certain amount (25 amps or so)....

a relay is used to switch on a huge circuit....its like a switch for a switch...

switch--->relay---->starter/lights/heater blower.

the switch engages the relay which engages the desired object

b

Posted by: porsche914blue Nov 10 2005, 07:59 PM

Relays allow a low power switch to control a large current device.

They have a low current side and a high current side. Power is applied to the low current side which energizes a magnetic field and draws the high current side open or closed (depending if the relay is Normally Open or Normally Closed).

In our little 914 relays (see photo above) power is applied to the copper coil, a magnetic field is created, pulls the top plate down and causes the high current side to make it's connection. Once the power is removed the magnetic field collapses and the spring pulls on the plate and breaks the connection on the high current side.

Their operation is pretty simple.

Posted by: Hammy Nov 10 2005, 08:06 PM

Thanks for explanation guys

I'm thinking about going and buying a book on basic electronics and such... Figure I'll solve a lot of 914 problems too

Posted by: motorhead Nov 10 2005, 08:20 PM

While you're at it, go to your local wrecking yard/s, see if you can find a wrecked teener. Shouldn't be hard. I grabbed about 3 or 4 as spares about 15 years ago. Headlights each have one, and a few in the relay board. As I recall, tariff was about 3 bucks for the batch. If you have one in the glovebox, you'll never need it.

Posted by: Headrage Nov 10 2005, 08:33 PM

QUOTE (motorhead @ Nov 10 2005, 06:20 PM)
If you have one in the glovebox, you'll never need it.

Posted by: blitZ Nov 11 2005, 06:06 AM

I had a similar problem when the heat lever is engaged, a fuse on the relay board blew, which is shared by the fuel pump. Are these relays interchangeable or unique to each socket?

Posted by: Walter Nov 11 2005, 08:25 AM

Bit OT, but I need such a complete relais board, since I want to start my engine seperate from the car...
Can't seem to find one over here for little money.

A PM will do

Thanks guys,
Walter

Posted by: blitZ Nov 11 2005, 08:48 AM

I think there are currently a few on ebay, if you can get the seller to ship it to you.

Posted by: Walter Nov 11 2005, 08:50 AM

QUOTE (blitZ @ Nov 11 2005, 06:48 AM)
I think there are currently a few on ebay, if you can get the seller to ship it to you.

Ok, thanks, I'll look there too!

Posted by: Dave_Darling Nov 11 2005, 12:09 PM

QUOTE (blitZ @ Nov 11 2005, 04:06 AM)
Are these relays interchangeable or unique to each socket?

The round relays are completely interchangeable. Some are different colors, which means they can handle different amounts of current, but I believe all of the ones in the 914 are the lowest-current ones they made. So any round Bosch relay will work in any 914 round relay socket.

--DD

Posted by: SirAndy Nov 11 2005, 12:13 PM

QUOTE (Walter @ Nov 11 2005, 07:25 AM)
Bit OT, but I need such a complete relais board, since I want to start my engine seperate from the car...

you can still buy them brand-spanking-new from porsche ...

i did, solved a lot of electrical gremlins i had in the car ...
Andy

Posted by: Flat VW Nov 11 2005, 12:13 PM

Howdy Dave,

Any idea what the "current rating" of those round relays in the teener may be?

John

Posted by: Dave_Darling Nov 11 2005, 01:25 PM

QUOTE (Flat VW @ Nov 11 2005, 10:13 AM)
Any idea what the "current rating" of those round relays in the teener may be?

Nope. I do believe that the black is the lowest one, and red is higher. There may be other colors, but I haven't seen them.

--DD

Posted by: Flat VW Nov 11 2005, 02:27 PM

QUOTE (Dave_Darling @ Nov 11 2005, 11:25 AM)

QUOTE (Flat VW @ Nov 11 2005, 10:13 AM)
Any idea what the "current rating" of those round relays in the teener may be?

Nope. I do believe that the black is the lowest one, and red is higher. There may be other colors, but I haven't seen them.

--DD

thx,

J