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So I figured out what my issue was. I needed to clear the eeprom. Now both extruders retract and extrude. I'll start the fine tuning over the weekend.

I swapped out the board for another RAMBO v1.3 with the same results, only E0 retracts/extrudes.

Still having issues, when I bring the hotend up to temp, and issue either T1 or T0 to switch filament, via Repetier-Host or using the LCD, only the motor attached to E0 will actually move. I can switch motors between E0 and E1, but still only the motor attached to E0 moves. I've contacted support, I ...

Ok, So I think I have it sorted now. Right after I posted the reply above, I checked the version of Arduino I was using, and it was 1.8.something. Downloaded and compiled the sketch using 1.6.0 and all is well again. Now to test the real change code.

RTFM.

So when I issue a T0 using Repetier-Host, I get the beep and this in the terminal window: < 9:04:35 PM: ø¹· ™ª¶¶ø%«øøtáìââ&øøþ‡€ƒ€“‡`„ÿ:/,ɀPÀ‚0âââââ”ââ^âââÿ—B â½£Üÿâââzâââ/ââÁââHøþ2Eâ⢘âNâ ââ ââââââââââââââââââââââââââââââââââââââââââˆàˆî‘à€ < 9:04:35 PM: qââââââââââââââââââââzâ&¢? ââ!â€âââââââ ...

I have installed a second extruder on my RMv3 and updated the Firmware to the latest from github (master). When I use Repetier-Host to switch extruders, the LCD emits a horrid beep which never stops until I power off the printer. It appears as if it's a full halt of the controller as Hot-end fan and ...

If your LCD panel get's to the Temp screen without the whip plugged into the hot end, and freezes when it is plugged in, then it sounds like you have faulty wiring in the whip. Head back to the manual and double check both your connections to the rambo and the connector at the hotend to make sure ...

I've seen this problem when the whip is not properly seated in the hotend.

Count me in. I have an E3D mounted but it's still using the accelerometer probe and the rambo.