Hi-speed cooling fan relay burns out

I have a 2000 GTP, and twice in the past 2 weeks it has blown the Fan 1 relay. The strange part is, the fan 1 relay is burned at the #30 pin, but the low speed fan blowing on the AC compressor still works. Weird. The Fan 2 relay is still good. I have checked all fuses--good. The fans will run if power is run straight to them from a power source. Both fans turn freely with no resistance.
What should I look for?

Sounds like your fan motor is drawing too much current. I'd recommend measuring the current draw and if it's out of spec, you probably need a new fan motor.

I could never find the source of the problem. I purchased a high speed fan control unit from Casper Electronics and installed it. Now I have control of my high speed fans and no cooling issues
during the 100 plus days in Texas.