There are two different board patterns, the early version where the wires where soldered in, the later version where they where in small sockets.
The soldered:
org
blk
yel
red blu
The socketed:
blu
blk
yel
red org
Beware of older units with the wires exiting the head that are covered by a blob of RTV. Too much stress and or flexing and the wires can break off at the head.