Thread: Open or closed relay?

Originally Posted by drivesafe

Technically you should be able to wire that specific relays coil contacts ( 85 and 86 ) in either direction, BUT some of these types of relays are polarised because they have a spike suppression diode across pins 85 and 86.

In this type of relay, you MUST wire the relays pin 85 to Ground/Earth, and pin 56 to 24v.

Most new relays have a suppression restore instead of the diode and as such, are NOT polarised.

The circuit diagram for that relay shows a suppression device wired across pins 85 and 86 but does not state what the device is, but most likely a resistor.

If your specific relay had a suppression diode and you wired it backwards, the first time you try to power it up, you will destroy the relay.

When you power the relay up, can you hear or feel it click, if it does click, all is wel

Tim,
Can you edit the second sentence to say "pin 86 to 24v."

Assuming that is what you mean.

Then a mod can delete this post if they like.

Tony

Pump now doing pump things,, sort of. Everything electrical is cool to the touch, relay, wires etc.
But pressure guage gets to around 40 psi and thats all it will do.

Yes the bus has air, has 6 bags to inflate so its handy that it does...
weigh up the time involved in getting a booking at a diesel mechanics shop big enough to have a lift or a pit, add in a couple of hours labour and thats why I bought a compressor.