3 phase full wave 3 scr and 3 diode gate controlled SCR  exciter assembly load test: I/p to the ASM 3 phase AC  62V, 48 HZ to  227V,128 Hz.           Output DC 125A continuous and 145 Amps for 5 min  to be loaded. [o/p is actually connected to Main alternator field  winding of resistance 1.38 ohm for excitation]. What are the alternative  methods to conduct load test without alternator field winding.