<VV> Convertible Top Pump Wiring

[Geoffrey Johnson]

It was mentioned on Corvair Center that a late model (80's or so) GM 
power top pump would work in place of the stock unit for an early 
Corvair convertible.  

Here is the question. We went and bought a motor out of a late 80's 
Sunbird today. Put it in and primed the lines. It works great with a 
battery jumped to the two wires. Puts the top up or down.  With the 
wiring connected stock, it will not work. It is obvious it does not 
ground. The new motor has no ground wire, and acts as if it does not 
need one. As in the wiring from the car it came out of swapped the 
polarity in the switch, providing +12 and ground through the switch, 
swapped per wire depending on switch position.. The switch here just 
provides +12 to either wire depending on switch, with ground at the 
pump. So did they change something? I tried grounding the motor and it 
would not work. The pump we got today looks identical to the ones listed 
as working on 60's GM's.

 Can someone explain the wiring on a stock unit?  
The pain is that now the lines are primed, I can not put the top up or 
down without jumping the pump.   Can not put it up or down manually like 
I have done for years.

Thanks
Geoff Johnson