(ET) Pulsing

[Rob Brockway <getractor yahoo com>]

 I have a Curtis 1204 set up with traditional contactors feeding an E20 
motor.  Under high load conditions climbing a hill or when the battery is 
50%-70% drained I am getting a pulsation perhaps 2-5 hz.  You can feel it 
and see it on the load meter.  I have not had time to make diagnostic 
measurements yet.  Has anyone run into this before?  The consistent pulse 
makes me think it is the controller.  The controller is 16-20 years old 
and I am wondering if it may be failing.  Any input is appreciated.
Rob Brockway
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