electric water pump wiring question?
 

http://ken.lowrance.com/projects/CSIwaterpump/

what is with the switch?? I just want the pump to come on when the car is on, why do I need a switch?

If I just hook up the ground, put the 12v power wire into a fuse under the hood, shouldnt that be sufficiant?

Re: electric water pump wiring question?
 

[QUOTE]Optional Procedure:

If you want an indicator lamp or switch in the inside of the car to tell you when the pump is running or not. You will need to run two wires to the inside of the car. The wires can be ran through the firewall through the rubber gourmet underneath the PCM. Find a good location for the switch and the indicator lamp, I made a custom bracket for mine that mounts where the cassette holder is. (PicLink) QUOTE]

;)

Re: electric water pump wiring question?
 

Ok thanks.... But what would the switch be for? is it to let the pump run while the car is off? Don't you just have to turn the ignition half way on (to where the radio comes on) to make that happen?

so I dont need a relay?

Re: electric water pump wiring question?
 

no switches for me....I just ran one wire to a fuse in the box under the hood and grounded the other. If the pump isn't on then the car gets hot FAST so I don't need a light to tell me that... ;)

Re: electric water pump wiring question?
 

You need a relay and a inline fuse. The relay runs to the hot junction and the ground junction, then you have the option of the light to let you know when it's on.

I suggest using the light. Make sure to wire it into the pump side fo the connector. I had my connector break and it showed i was still getting power because it was on the other side of the connector, which wasn't connected to the pump any longer :p

-Shannon

Re: electric water pump wiring question?
 

I still dont understand why I need a relay when I will not have a light or switch. And again, what is the switch for??? you can put your ignition half way on and the pump will come on without the engine on, right?

Re: electric water pump wiring question?
 

the relay can handle higher currants then the wiring in your car

use it so you don't melt your wiring and maybe start a fire

Re: electric water pump wiring question?
 

yep, safety :cool:

Re: electric water pump wiring question?
 

What the others said. Safety is the main concern. You don't have to have a switch, and I personally wouldn't use one since it is wired into your ignition directly anyways.

I would recommend a light due to the fact that I don't want to look at the temp level all the time i'm driving to be sure the pumps is working. By the time the high temp light comes on, it's gonna be too late.

-Shannon

Re: electric water pump wiring question?
 

many people put a switch on so when you are at the race track, you can run the pump and fan while in the staging lanes to cool the engine down. If you wont be racing or dont want to do this, then you dont need a switch. You should use a relay for the power though.