revtothelimit - motorbike forum

Hello all,

below you will see two relays

The one at the top was bought to replace the one at the bottom. I was led to believe they were the same. I now know they are not.

Which wires do I switch to make the new one work?

Depends how many supplies you want to switch? One or two....

v8-powered wrote: Tue Nov 01, 2022 9:08 am Depends how many supplies you want to switch? One or two....

I'm afraid I don't know

Its for the Air con on my van if that helps at all??

Would assume it will switch the supply to the compressor maybe? If so following should work:

Pins 85 and 86 - no change
Supply you are switching - 30 and 87 on new relay

Are there cables connected to all terminals on the old relay?

You would have to remove the connection to 87a and connect it, along with the existing connection, to 87 (so both wires are on 87 and none on 87a).
The old relay switches two circuits on and off together, the new one alternates between them.
Or, buy the correct relay, which would be the better solution.

Zimbo wrote: Tue Nov 01, 2022 5:37 pm You would have to remove the connection to 87a and connect it, along with the existing connection, to 87 (so both wires are on 87 and none on 87a).
The old relay switches two circuits on and off together, the new one alternates between them.
Or, buy the correct relay, which would be the better solution.

That's what I had tried to do, I thought I got the numbers matched !!

Would you be kind enough to let me know what I should be looking for, as I'd prefer the right relay if possible

A quick search came up with this which looks like the correct relay with 2x 15A outputs.
https://www.ebay.com/itm/265307000694

Just realised the link I posted is for a used relay. Here is a link to 2 x new relays from China.
https://www.ebay.com/itm/115356145844

Big Red wrote: Wed Nov 02, 2022 1:52 pm Just realised the link I posted is for a used relay. Here is a link to 2 x new relays from China.
https://www.ebay.com/itm/115356145844

Those ones are 24v !?

Jody wrote: Wed Nov 02, 2022 7:24 am

Zimbo wrote: Tue Nov 01, 2022 5:37 pm You would have to remove the connection to 87a and connect it, along with the existing connection, to 87 (so both wires are on 87 and none on 87a).
The old relay switches two circuits on and off together, the new one alternates between them.
Or, buy the correct relay, which would be the better solution.

That's what I had tried to do, I thought I got the numbers matched !!

Would you be kind enough to let me know what I should be looking for, as I'd prefer the right relay if possible

Something like this, I'd say

https://www.electricalcarservices.com/s ... 3jEALw_wcB

They aren't that common, you need a double pole, single throw (DPST) relay, not a SPDT (changeover) relay, which is the replacement one you bought and the most common type.

Duarite 0-727-22

Lucas SRB528

Hella 4RA 003 510 137

Zimbo wrote: Wed Nov 02, 2022 7:16 pm Duarite 0-727-22

Lucas SRB528

Hella 4RA 003 510 137

Ordered, assuming it works, I owe you a beer

Did it work then?

Zimbo wrote: Mon Nov 07, 2022 5:24 pm Did it work then?

It's not here yet!

First one got lost in the post.
Ordered another and now we wait