Dead Extruder Driver?

[Glacian22]

Hey all, I'm having a really rough time with this particular problem. I decided to try out a different extruder, so I unplugged the extruder motor from ext0 (while the printer was off of course), and plugged in the new one. Fired everything up, no response from the new motor. Powered down, unplugged it, plugged in the old one, it works just fine. Tested the new motor on a RAMPS board, that one works just fine. After switching them a few times now NEITHER one works on ext0. So I thought maybe I somehow fried the stepper driver? I went into the firmware and changed the following:

#define ORIG_E0_STEP_PIN 34
#define ORIG_E0_DIR_PIN 43
#define ORIG_E0_ENABLE_PIN 26
#define E0_MS1_PIN 65
#define E0_MS2_PIN 66

#define ORIG_E1_STEP_PIN 33
#define ORIG_E1_DIR_PIN 42
#define ORIG_E1_ENABLE_PIN 25
#define E1_MS1_PIN 63
#define E1_MS2_PIN 64

I just straight up switched all of the pin assignments for E0 and E1, which should let me plug in a motor to ext1 and have everything function, correct? Still no joy with either the old extruder motor or the new. Guys I don't know what else to try, anyone have any bright ideas?

[Glacian22]

Dammit, apparently the extruder won't run unless the hotend is hot. I feel like a moron.

[Earthbound]

The other item that must be set to use the E1 stepper output is the motor current limit, if you haven't already done so. It is also in Configuration.h and by default the E1 driver is set to 0.