Lifted from Pelican Parts 944 forum
Originally from Adrian Jaye - is he still around?
READ ALL POINTS BEFORE COMMENCING
Any problems contact me before starting
HI after ages I've sussed it.
ok disclaimer time:
1) If your not electrically minded find someone who is
2) Some safety features may not work
3) This is independent of TIPEC or PORSCHE
ok,
Parts required
1) Wire, 8A or better
2) Fuse & fuse holder 5A
3) Chocolate strip or crimp connector 8A
here we go:
1) You need to find a Live feed, either from the ignition on or
Permanent on. (I used the feed going to my stereo - which has a
switch already wired via it - long story)
2) Remove the stereo, the container underneath it and ashtray in
console.
3) Undo the 4 screw's holding the console/gear stick panel and lift up
as far as you can.
4) I also removed the gearstick so I could completely work on the
switch, if you think you could do the rest of the procedure without
doing this, then fine.
5) Remove the connector from the bottom of the hood switch.
6) Identify pin 2 (this is marked) and leaving as much length from
the pin back (about 2"-3") cut this cable (Blue/Black)
7) Tape up the rest of the wire loom so that other part of the
blue/black cable can't ground against anything.
Take your live feed and using either a crimp or chocolate strip, wire in the fuse holder and take the output of the fuse holder and
make another connection to the blue/black cable going to the switch.
9) In true Haynes style re-fitting is reverse of removal ! (but test
it all out before).
10) Now you can lower and raise the roof with the engine running.
Warning !!!!
1) You MUST make sure that you don't attempt to lower the roof
inadvertently with it locked, (as this has now been bypassed as well)
you will "Shag" the motor.
ADDENDUM 24/3/02 – I now think this is not the case !
2) IF you have taken the feed from a permanent feed when closing the
roof (with the windows fully up) (and ignition switch off you must lower
the windows a bit otherwise it will foul. HOWEVER if you are doing this
with the key in pos.1 or engine running the windows will go down
automatically as before.
3) If you can wire a switch in between the fuse and mount it near to
you. This will stop your passenger accidentally pressing the button
to lower the roof with the lock on
ADDENDUM see point 1)
4) Also if your working on the car yourself or sending it away,
pulling the Fuse which controls the hood and/or the G21 relay will
stop any accidents.
5) Don't forget to let the next owner about the mod ! If you do it my
way you can put the car back to normal in about 15miniutes
Epilogue.
I've used chocolate strips so I can put the car back to normal with
the minimal of fuss. Also so I can work out later to wire the live
feed through the W/screen frame switches. If anyone can tell me were
I can get easy access to the CONNECTION LOCKING SWITCH plug or the
CONNECTION ELECTRIC TOP plug T20, let me know !
looks to be fairly simple on the switch wiring ideally on a switched feed but warnings noted which could make it a liability rather than a benefit. 
