Ignition wiring 3 or 4 wires which one is correct

[shaka1976]

I have a part restored 71 crossover Bay and I have some confusion over the ignition wiring. The ignition wiring has been replaced with a 4 wire switch. which looks to be incorrect as the ignition is permanently live and I have a black wire that isn't connected. I'm guessing the wrong ignition switch was fitted, as when I connected the black wire is started to burn out. When I look at C&C they only list one type but GSF list a various. Which one is correct??
Model Year Part No Price
T1/T2 68-70 92801 £27.40
T2 71-74 92802 £19.25
T1/T2 74> 92804 £4.75
:msn4:

 

[sparkywig]

I've answered this elsewhere.

I've got the same ignition switch and the black cable is spare. The ignition does have a permanent feed.

Mine's no. 22

http://www.vwheritage.com/vwh/VW-Camper-Van-Parts/Bus-Parts-1968-79/Electrical/Ignition-Starter/?templateID=vwh" onclick="window.open(this.href);return false;