Hella relay help

[RMecum]

I bought a weather proof relay from Geno's for my back up lights and there's no instructions/info on which wires go where. There's a blue wire, black wire and three red wires.



I found some instructions on TDR about hooking them up so they can be automaticly or manually turned on so that's my plan but I need to know which wires do what on here... :/



Any help is appreciated.

Mike

 

[seafish]

Here is one way to do it... just ignore the colors and look at the NUMBERS by each wire on the relay--

 

[seafish]

And here is another way if you only want a manual on-off switch , not on-off-auto on like the diagram above.

 

[seafish]

Also, it sounds as if you have a 5 pin relay instead of the 4 pin relays in the diagrams above, BUT if you just use the numbers, you will know which wire is extra on your relay, and you can simply cap that one. Do be sure to cap it, because it WILL be energized with #87. IIRC, the pins on a 5 pin relay are labeled 87a and 87b, 86,85 30, with 87a and 87b serving the same function.

 

[RMecum]

Here's the rub

There are no numbers on the housing where the wires come out or on the relay if I pull it from the housing! I have both of those diagrams ready to go but I don't know which numbers go with which color wire! I'm going to have to call Geno's tomorrow and see if they know or maybe left a diagram out of my shipment.



This relay is probably for folks who use them all the time and know where stuff goes and not a 'tard like me!



Mike

 

[DieselDoghouse]

Generally the layout of the blades on the relay will give you a clue on ANY iso style automotive relay, no matter the brand:



The one blade NOT parallel to the case edge must be #30. Therefore the blade(s) directly across the case and parallel to ther edge are #87 and 87A on a four terminal (spst) or five terminal (spdt) relay respectively. To either side of that pin 30 are #85 and its partner #86. You don't need to be too concerned which is which- they are simply each end of the relay coil.



Btw, terminal #30 supplies the moving arm of the relay

Terminal 87 is the normally open (unenergized) contact

Terminal 87A is the normally closed (unenergized) contact.



Hope that helps.

 

[RMecum]

Thanks DieselDoghouse!

I read your post and went and found a relay that has marks on it and your info helped me confirm which wire does what... Thanks! I'll have my back up lights working this afternoon!



Mike

 

[DieselDoghouse]

Glad to hear it, happy to help!