electrical Power while running

Hi
I need to wire my new Radiator with duel fans, and i need to wire to "power while running". Whats the easiest place to find, to tap into?... thanks in advance..

Bill

Are you going to be using a relay kit to power the fans?

I would run relays and fuses straight from the battery. Our trucks are really equipped with big enough wires to hold up to dual electric fans.

On mine what I did was power from battery to relay. Then I have a thermo sensor for one fan that give the relay ground and the other one runs off a switch for backup. I'm using a Ford windstar fans.

You definitely want to use relays or an integrated fan controller ( which has relays in it) connected directly to your battery. If you just buy your own relays, make sure you use a fuse or fusible link where you connect to the battery. Then provide power to the controller (or relays) with an ignition-on power source. I’m sure you can find a wiring diagram with a quick internet search.

My ‘75 K25 has an ignition-on brown wire coming out of the harness in direction of the driver’s side fender. It was originally designed to activate a relay for the dual battery in my camper special. If you have a similar wire it would work to turn on your fan controller.

WP29P4A said:

Are you going to be using a relay kit to power the fans?

Click to expand...

I have the whole harness with all the relays that came with the Entopy Radiator . I just have a set of wires that need to go to "power while running". (image attached.. Wire reference in the red Box)

A quick search online to locate a wiring diagram will take some of the mystery out of the adventure, and give you options on which wires are hot when Ignition is on.

WP29P4A said:

A quick search online to locate a wiring diagram will take some of the mystery out of the adventure, and give you options on which wires are hot when Ignition is on.

Click to expand...

Thanks man... I've done a ton of searching and not finding much.. the fun of building custom i guess... even the GM techs can't help because their computers won't tell them.. they're as frustrated as I am. As I spent a bunch of money on a brand new Crate motor from GM.. which has been a great customer service experience as far as I'm concerned.. But still looking for answers. 1st build.. I have no clue what im doing
.. LOL

What year is your truck? Going by your diagram you got you just need switch power which is not a lot so here is a option for you.

If you have a msd coil or super coil of any sorts run another wire from your battery to a relay and run it to your coil and use that wire that went to your coil for power to your 3 relays. It takes a lot of stress off the ignition switch running your coil off a relay then just the steering column switch. And the coil gets better power

Originalthor said:

What year is your truck? Going by your diagram you got you just need switch power which is not a lot so here is a option for you.

If you have a msd coil or super coil of any sorts run another wire from your battery to a relay and run it to your coil and use that wire that went to your coil for power to your 3 relays. It takes a lot of stress off the ignition switch running your coil off a relay then just the steering column switch. And the coil gets better power

Click to expand...

It's a 74. I have an MSD Coil. This is an easy solution.. thanks