I know some people may say that it isn't neccessary to use a relay for the purge, but I want to use one just for safty seeing as how I can't see any downsides of using one. I was wondering if this sketch I made would work for wiring up my purge. And if something is wrong with it if you could please tell me how to correct it. I was also wondering what size fuse to use.

Thanks in advance

 

That won't work properly.


First get rid of the second switch (arming switch). You only need one switch to run the purge, preferably a momentary switch. What I have done here below is make the purge its own circuit away from the nitrous system completely.



Pin 86 needs to have a switched 12 volt power........anything that is on when the key is on, and is off when the key is off. (fused also) Hook this up to one side of your momentary switch, other side of the switch will have the switched 12 volt power. When the button is pushed down, the switched 12V power will be sent to the relay turning it on.

Pin 85 is a ground, which you have right.

Pin 30 needs to have a 12 volt battery source (run directly to battery)

Pin 87 needs to run to one of the 2 wires on the purge solenoid.

Other wire on the purge needs to hooked to a ground source (get rid of the fuse you have there)

That should do it.

-Brian

 

The drawing looks good. You are using a 12 volt to control the ground side of your purge valve. Your toggle switch can also be your arming switch for your complete system...

Ricky

 

Shouldn't the solenoid have one wire going to 12v source and one grounded? It looks like you have both of them going to a 12v source.

 

The lay out the relay is controlling the ground signal to the noid. The hot is already wired in place.