A lot of variables here. It could be anything such as shorts in wires. Who knows.
However, you have two fans hooked onto a single relay. You said you've done this before, but I think your eBay fans are giving you the problem here. As both fans turn on, the DRAW of power is a lot. The fans might be requiring more power than what you are used to. As the draw of power remains constant, the copper wires heat up. The resistance of copper increases as its temperature increases requiring more power to operate your fans. Then add in the fact of probably having small gauged wires and you have the perfect recipe for your wiring to heat up and fuses to blow.
Those eBay Fan motors probably ain't doing you a favor here.
For relay wire Ref check this out": DIN 72552 Relay Info
Heavy gauge wiring is something I have always done in this area.
If it where a short somewhere in the system I would think you would blow a fuse pretty fast. You said it take a couple of days. So this is why I said what I said about heat and resistance. You need so see why your trigger wire is drawing so much power. The draw of power might be heating up your relay to the point your trigger wire is now effected. I been using 70 amp fan relays to guard against this. See if this helps or not. good luck.
However, you have two fans hooked onto a single relay. You said you've done this before, but I think your eBay fans are giving you the problem here. As both fans turn on, the DRAW of power is a lot. The fans might be requiring more power than what you are used to. As the draw of power remains constant, the copper wires heat up. The resistance of copper increases as its temperature increases requiring more power to operate your fans. Then add in the fact of probably having small gauged wires and you have the perfect recipe for your wiring to heat up and fuses to blow.
Those eBay Fan motors probably ain't doing you a favor here.
For relay wire Ref check this out": DIN 72552 Relay Info
Heavy gauge wiring is something I have always done in this area.
If it where a short somewhere in the system I would think you would blow a fuse pretty fast. You said it take a couple of days. So this is why I said what I said about heat and resistance. You need so see why your trigger wire is drawing so much power. The draw of power might be heating up your relay to the point your trigger wire is now effected. I been using 70 amp fan relays to guard against this. See if this helps or not. good luck.
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. I haven't had time to mess with it yet. I'll do an amp draw test on the both the fan side and the control circuit and replace the relay as soon as I have a chance to pick one up and get back in the garage. It's just weird to me that the trigger fuse is what's blowing and not the fan fuse. I do remember now that when we first got the car running the relay quit on us. I was a used one i had laying around so I didn't think much of it. Now I am realy leaning toward the fans shorting out and somehow taking out the control side fuse. Can't wait to cut open the current relay and see what's going on inside.
