This spring my '94 Z-28 convertible top stopped going down.  (no jokes
please!)  Up works fine.  I am currently manipulating the roof manually.
When I push the button to lower the top the pump in the trunk does not come
on, it does to put the top up.  I guess it is supposed to come on for down,
but am not sure and have not been able to find any repair manuals that
include convertible top information.

I was surprised to find that the pump has only two wires going to it - I
figured there would at least be a ground and an up and a down control of
some sort.  Needless to say I have no idea how this works, can't find
manuals (but have not checked the source - GM - for fear of big $$$s.)

I considered placing the up/down three position switch in the console, but
then when I saw only two wires to the pump I figured I did not understand
this thing very well and there must be some circuitry between the switch and
pump.  I have been unable to find a wiring diagram that includes the
convertible circuitry.

HELP!.  Suggestions, references, etc would all be appreciated.  If I was not
as cost sensitive as I am at the moment I would bring the car to my local
dealership, but times are not good financially...

Thanks,

Peter