Relay wire sizes

[Sonny]

60-65 amps

next to consider... fan consumption. Yes relay says is able to handle 30 amps, but who says the fan sucks that load ? Relay is not a load sucker so despite the relay specs and check the fan specs. Modern fans are able to be handled on 16 or 14 gauge wires, and most on them get the pigtail made on that wire size. I don't think your fan will suck 30 amps really. I'd say more like 18-20 amps

 

[bearman]

I wonder why you have the fans direct. I would do a two stage for example have one turn on at 180 degrees and then the next one turn on at 195 this way the draw of fans not always on and engine temp maintained were you want it. Of course you need to think of the t-stat when it opens and closes. Less load on alt and temp is doing what it needs to do.

 

[Nacho-RT74]

I wonder why you have the fans direct. I would do a two stage for example have one turn on at 180 degrees and then the next one turn on at 195 this way the draw of fans not always on and engine temp maintained were you want it. Of course you need to think of the t-stat when it opens and closes. Less load on alt and temp is doing what it needs to do.

first one maybe a little lower. that will retard the T-stat opening and will work more less like the clucth setup, which allows to suck some air still being cold

 

[Nacho-RT74]

I have dual 12” fans and the instructions said they together draw 30.

oh ok, its a dual setup... so I was about right on load thinking it was single LOL

 

[451Mopar]

I use this hall effect current sensor for testing circuits. It works pretty good, and seems pretty accurate when compared to a shunt type ammeter, but wire had to go through the sensor, it won't clip on. Measures up to 100 Amps.

https://www.amazon.com/bayite-Digital-Current-Voltage-Transformer/dp/B01DDQM6Z4?ref_=ast_sto_dp

 

[bearman]

I agree you can get whatever temp sensor you want have them come on a little early etc. I just don't see having them on all the time.