Relay Help

[dufkis]

I know I am being dumb but I wanna make sure I am wiring this up right.

OK so normaly 87a has power when +12 is applied to 30, then when the coil (85+86) is energized it will flip over to 87 right????

Thanks,
Joel

BTW this was a quick job in paint so laugh away.

[1slo5.0]

power to 30, switched power to 86, ground to 85, 87 and 87a for the accessories you want to power up with the relay.

http://www.slapnuts.org/images/relaywire.jpg

[Jesse James]

Yes Joel. If the drawing shown has the the coil de-energized and the relay in position 87a, when the coil is energized the switch should move to position 87. Is there a contact position listed for 87a and 87? NC=normally closed or NO=normally open. Typically a relay similar to your drawing is spring loaded. Hope this helps.

[Greg@GLD]

This depends on the style of the relay. As james mentioned, "NO" and NC" refer to the relay in the de-energized state. In the pix that Darrel posted, that is a style of relay that is open at rest (there is no connection of any kind) and the relay style Joel posted is one where at rest there is a connection between 30 and 87A when there is no power to the relay's coil, and yes, when the relay coil is energized, the power fed in from 30 is now fed to whatever circuit it wired to 87. The two are not the same. The relay that Brotha Darrell shows is not the same one, that's the typical 30-amp relay sold at Radio Shack or included in most nitrous kits or other applications where a relay is needed for the higher current present in the active circuit.

The relay Joel is asking about is a SPDT relay and the relay Darrell pictured is a SPST.
Different animals.

[Greg@GLD]

Added: note the relay Joel asked about is a 5-contact relay and Darrell's a 4-contact...

[dufkis]

Thanks Guys!

[Kirk]

Another pic.

http://www.6066gmctrucks.org/electrical/RelayCircuits.jpg

[1slo5.0]

Added: note the relay Joel asked about is a 5-contact relay and Darrell's a 4-contact...


oops, I didn't even notice that. I guess I need to fully read posts before I post :greg:

[FastGT94]

I wish I knew step two of electrical stuff 101

I got as far as step one

-First, disconnect the main pow.......... ZAP!!!!!

hehe. You guys are smart :thewave:

Does this mean you could help me hook a small LED up for my fan switch? All the switch does is route a wire directly to a ground. Just a little on-off toggle switch. :flg:

Would it be as simple as having the ground for the LED going to the switch and then to the frame from the switch?

[Chris91LX]

Bah, I still can't understand this stuff. Is there a difference between a 4 pin and a 5 pin connector if your not using the 87A pin? I'm having fuel delivery problems at high rpm and I don't know if this is my problem or not. I'm using a four pin, it's wired right, but the diagram for inline fuel pumps in the manual shows a 5 pin relay, not the 4 pin I bought at radio shack. I picked up a 5 pin relay but don't know if it's going to make any difference.

[RSNovi]

A 5 pin relay contains both a normally open contact and a normally closed contact. Typically the normally closed contact is not used, but I use it in nitrous and transbrake applications.

Just make sure the relay you are using is capable of handling the current draw of the pump.

[Chris91LX]

So there is no difference between the 5 pin and the 4 pin if you are not using 87A? You have to speak slowly and make short answers to me when it comes to electrical stuff.

The 4 pin relay in there now is a 30 amp relay, I don't think there is any issue with the relay and the current draw.

[Cobrawife]

Those relays do go bad. The contacts can become burnt from heavy use. If you are having issues and you think the relay is the culprit, examine the contact terminals very closely. Look for signs of discoloration or slightly melted plastic at the point where the terminals on the relay pass thru the case. On some you can simply un-snap the outer case and you will see the contacts are all burnt.

A 5-pin relay can be used where a 4-pin is called for, provided the circuit is properly wired to the relay it's used in.

[Chris91LX]

The relays are brand new, my confusion is with the 4 pin vs. 5 pin.

[Greg@GLD]

No worries Chris. RSNovi explained it right. As long as you use the normally OPEN set of contacts, you can leave the NC contact unused.

[Chris91LX]

Bummer, so my problem is somewhere else.