OK, heres the deal.
Yesterday I installed my ls1 fans and they ran fine all day. Today, I blew one fuse after the other. All the people I talked to, said a 30 amp fuse would handle them. (None of the guys on here however) I'm running 10 guage power hot wire to power the fan. I do have a numerous crimp connectors throughout the wiring. The resistance is greater at the crimps but I dunno. I guess what I'm asking is what kind of current do these fans really pull???

 

do you have a multimeter to check for a short and does it pop the fuse just when you put it in or do they run for a minute. little more detail in the gripe might be helpful. not sure of the current draw.

 

They ran for a whole day just fine. Then today it pops then right when I put them in.

 

No obvious shorts BTW

 

30 amp fuses are fine you probably have too much juice with the 10 ga wire. you should have used a 14 ga wire. its plenty. on the current draw, i dont know but they do draw some current..

 

if the fans don't even have a chance to start turning before the fuse blows then there got to be a short some where wether its in the fan motor itself or just along the line some where. if you have a multimeter you can read for resistance to ground. put the red lead in where the fuse holder is and the black lead to ground you should read to ground becouse the other end is connected but make sure it has a high resistance if it seems loe then take the pig tail off the fan motors and read them out if the resistance is really low then you know you have a bad fan motor. if there both kinda high and read about the same between the to then move on to the wires but the short has to be between the motors on the fans and the +power source not after other wise it would just be ground and work like its suppose to. tell me if this don't make since i'll try to explain better.

 

The fans will start turning, they get up to full speed and shut off. I do understand what you are talking about 4.8T.
Rob'sGMCSS - I didn't think it would matter if it had a larger wire. 10 guage is meant to handle 30 amps.

 

put in a 40amp and see if it holds thats what i would. thats what i was trying to get at rather or not the were get up to speed. just throw in a 40 10awg will hold that fine.

 

come to think of it right now i just have a single junkyard fan in my truck and i think i'm running like a 35 or 40 in it

 

I'll go ahead and try that. I know for a fact that a 10 gauge wire will hold the 30 amps, but if for some reason they are drawing more, I'd rather not have a melted harness.