Thats exactly how I did it: Removed heater (see other threads on this), had to open up the heater loom & go back 5cms to find undamaged cable then crimped on a 6mm female spade connector. On the car side I cut the cable off where it goes into the connector & crimped on a 10cm length of suitable sized cable with a male spade connector, covered with heatshrink & connected it all together to check it out. I got communication with the heater controller straight away, lots of faults logged but none relating to glow plug faults, cleared faults, shorted temp sensor in front of car & started engine, hey presto heater spins & tries to ignite, had to stop there as needed car so unplugged it all, will carry on nexrt week but so far so good, thanks to everyone for their help. Only thing my cheapo version of the vagcom sotware wont let me do is test seperate functions, i.e fuel pump & blower motor, is there a way to do this or do I need to buy the upgraded software