(ET) Strange Alltrax behavior

[Steve Gaarder <gaarder ecovillage ithaca ny us>]

I have an E-15 with an Alltrax controller and BB-600 batteries.  The speed 
control pot is on a throttle lever and the foot switch is controlled by a 
separate switch.  The first time I start it up it's ok.  I turn on the key 
switch, the contactor closes and then opens a few seconds later.  I turn 
on the "foot" switch, the contactor closes, and off we go.  It's all fine 
till I turn off the foot switch.  After that, it will not run.  Turning on 
the key switch makes the contactor close, again for a few seconds, but it 
does not close when I turn on the foot switch.  THe controller LED remains 
a steady green.  If I let it sit turned off for 15 minutes or so, it will 
run again.

Any ideas?

Steve Gaarder