Greetings,  I have an 87 westy with an all electronic aftermarket cruise
unit from specific cruise systems.  The control unit indicates by led that
the power is on when I switch it on.  The engaged led lights when I push the
set button which oddly enough seems to be on an oem turn signal though there
is no evidence that the van had an oem cruise unit before (would like to
purchase oem cruise unit if I can't fix this one).  There in no response at
all from the servo unit.  The engage light then goes out after a few
seconds. The engage light will also go out if I press the brake pedal before
it has timed out from presumably no response from the servo unit.  It used
to operate well for the last 30k miles I've had the van.
Ive spliced together all the wires from front to back and checked for
continuity.  I've dissassembled both the control unit and the servo unit and
all appears well.  The manufacturer has no replacement parts for the unit.
I have no manual or schematics. The cable to the throttle is not broken and
moves freely.  I have a condition that demands a cruise unit or other means
of operating the throttle without using my right leg for extended periods.
Any help would be appreciated.  Mike
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