Can I tap into the alternator wire plus box?

[Headhunter38]

I'm temporarily installing my electric fan setup for countering the heat soak. In the future I will be permanently installing it with an extra fuse block and terminal junctions etc, for now though I just want to test it out and have something working. Since I'm only temporarily installing it I'm wondering if I can tap into the plus box that the alternator wire runs to. The third picture from this post https://www.toyotavantech.com/forum/content.php?201-Replacing-the-alternator-harness. Would this stress the electrical system too much? The fan I'm using is a torqflo 733670 and it pulls about 5 amps continuous. I would also be tapping in the couple relays that are powering the fan. If the fan is too much and I need to run it directly to the battery, should the relays be okay to tap in, I have to positive side wires I need to hook up.

[Jan-Willem]

I see no reason why you can't connect a fan to the plus box, if you use a relay, and a fuse between the relay and the plus box.

I don't understand what you mean by tapping in to the couple relays, what are you going to use to trigger the fan? A thermo sensor, a switch, a timer?

[Headhunter38]

I don't understand what you mean by tapping in to the couple relays, what are you going to use to trigger the fan? A thermo sensor, a switch, a timer?

I meant that if the fan side of the relay was too much then would the trigger side be still okay to wire in since that part doesn't use much power.

[Headhunter38]

what are you going to use to trigger the fan? A thermo sensor, a switch, a timer?

I'm going to be using a combination of a thermostat switch, standard relay, and a time delay off relay. Similar to the setup Tim talked about in the heat soak thread. I'll post pictures there with a more detailed description of it later.