Electric cooling fan help

[CallmeKyle]

Hey all, I’ve got a 89 k5 Jimmy that needed a radiator. I went ahead and upgraded with a dual electric fan setup. But now that I’m wiring it I’m having trouble finding a good spot to connect for the key-on power to the relay. Is there a wire or place that is easy?. Also do I have to run the power directly from the battery or can I use the fusible link block?

 

[6872xtc]

Keyed power for the relay control wire is easy. There are several spots on your fuse panel under the dash.

The main power for the relay to send to the fans is probably best from the battery, as it is closer to the fans. At least my '90 has the fuse link block on the firewall, so that's why I say this.

 

[K85 Octane]

What’s the key on power for?
Don’t most folks just run power from the battery to relays and a temp probe in the radiator to switch the relay on?

 

[Blue85]

Hey all, I’ve got a 89 k5 Jimmy that needed a radiator. I went ahead and upgraded with a dual electric fan setup. But now that I’m wiring it I’m having trouble finding a good spot to connect for the key-on power to the relay. Is there a wire or place that is easy?. Also do I have to run the power directly from the battery or can I use the fusible link block?

The first question is how you plan to control it. As in, you need a temperature probe somewhere, but there are different types and different locations. The idea often comes up to switch it off and on manually with a toggle switch, but that's a bad enough plan that it's better to stick with a clutch fan.

 

[6872xtc]

What’s the key on power for?
Don’t most folks just run power from the battery to relays and a temp probe in the radiator to switch the relay on?

I personally would have the power for the temperature control, probe or sensor in the engine, to be ignition hot, not constant hot, that way it can't stick a switch on and keep running after the key is off.