Relay questions..

[j par]

I'm using relay's for high and low beam, radiator fan and AC fan with an extra spare circuit connected to an electric fuel pump wire as a trigger and all three others are dead man off for any future connection I may need..
I have a power source that I'm using to test things out and when I connect it up to regular battery and ground the relay I believe for the fan clicks on which may be normal as in it may have power all the time. But what gets me is the relay clicks and there's nothing else connected to it? There's also a very very minor amperage draw?.. I have all of the grounds connected in a series yet not connected to anything and it still clicks no power going to anything just power to the trigger switch and it clicks?.. and draws amperage? Not a lot but still a draw...
I guess my question is just normal I didn't think it would trigger unless it had a ground..?
Thank you for anybody's experience and their time..

74 Power Wagon..

 

[pishta]

A relay is just an electromagnetic switch. It will take amperage (~130 milliamps!) to drive the relay (Bosch 30A) but its very small compared to the 30A loads current draw. you can use the original light switch power lead to serve as the trigger voltage for the relay and then the relay will provide the heavy current switching straight from the battery 13.2V buss. Same with all the other loads. you can make or break the 86 side circuit or the 85 side circuit to activate the relay. Many devices use the ground side to control the circuit for safety reasons.

 

[j par]

A relay is just an electromagnetic switch. It will take amperage (~130 milliamps!) to drive the relay (Bosch 30A) but its very small compared to the 30A loads current draw. you can use the original light switch power lead to serve as the trigger voltage for the relay and then the relay will provide the heavy current switching straight from the battery 13.2V buss. Same with all the other loads.

That's exactly how I have the headlights hooked up. I mistakenly thought that the fan wire was only triggered by ignition on and it's on all of the time. So I'm going to end up using the fuel pump trigger to trigger the main radiator fan.. which is just on when ignition is on... I pulled that fan fuse and everything stopped clicking when I connected the battery and no amperage...
I appreciate your answer I think this one's pretty much solved..

 

[pishta]

you can even trip that fan on with a 120F thermoswitch off a water jacket. You dont need that fan running at all if your just warming up the car. youcan find them screwed into water heated intakes of many 80s jap cars. They turn "on" the EGR systems (or activate the solenoids that open the vacuum lines to the vacuum amplifiers that run the EGR valve, incredible complicated system for what it accomplishes!) IIRC Mopar just used a thermo valve that opened its vacuum source to the EGR valve on reaching operating temp.

 

[j par]

you can even trip that fan on with a 120F thermoswitch off a water jacket. You dont need that fan running at all if your just warming up the car. youcan find them screwed into water heated intakes of many 80s jap cars. They turn "on" the EGR systems (or activate the solenoids that open the vacuum lines to the vacuum amplifiers that run the EGR valve, incredible complicated system for what it accomplishes!) IIRC Mopar just used a thermo valve that opened its vacuum source to the EGR valve on reaching operating temp.

Agreed.. I have a couple extra thermal controlled regulators and I was going to use one on the negative of the fan... I just want the power to cut off when I turn the ignition off not keep running until it cools off...