I was reading the Vortech supercharger installation instructions and wanted to do something similar to what they have done for tapping a relay to power the aftercooler water pump relay. It is very difficult to understand what they are doing from reading the instructions.

Can somebody please provide a more verbose description of what needs to be modified and how they tapped the relay for juice?

TIA

-YS

 

The Vortech water pump uses juice directly from the battery. To get the juice from the battery, a relay must be used. What a relay does essentially is take a low power signal to close another the circuit, which in turn connects the battery directly with the appliance, in this case, the water pump. The water pump relay gets its low current signal from the fan relay switch, which becomes "hot" whenever the ignition is ON. The fan relay itself is not big enough or strong enough to power both the fan AND the water pump but is strong enough to power the low power circuit of the water pump relay.
If you take a look at a typical relay, you will see at least 4 pins. 2 pins for each circuit. The low power (or activating) circuit has one wire coming from, in this case, the fan motor relay switch. The other wire (or pin) goes to a ground to complete this circuit. Once this circuit is powered, it closes the other, high power circuit (or the other two pins). One of those pins comes from the battery "hot" terminal and has an inline fuse on it. The last (and 4th) pin has a wire that takes this power down to the water pump "hot" connection and the water pump is then grounded by it's ground wire to complete that circuit.
Other systems on a car use relays as well - lights, horns and of course, fans. You always want to power high draw appliances directly off a "fused" battery circuit rather than putting that power through a switch.
Clear as mud?

 

Here is some good info on how to wire a relay.

http://www.classictruckshop.com/clubs/earl...bosch/relay.htm

 

I guess I wasn't clear

The Vortech kit taps the Heater Motor relay in the fuse box. What does the tap they are using look like and when they say to modify the Heater Motor relay in their instructions, what do they mean?

-YS

 

Nevermind....I see it now. They were just removing the plastic from the Heater Motor relay so it didn't pinch the wire tap

-YS