MAPPING OF 2003 CATERHAM CLUBSPORT CHASSIS HARNESS TO DURATEC ENGINE WIRING HARNESS (GWM 2268062003)
PIN of CHASSIS Connector	colors	function	Connects to
1	black/red	N/C - ends under the dash	* I wired this to the BLUE/WHITE wire from the ECU
2	yellow/green	+12v to fuel pump	Orange from ECU
3	white/red	ignition start	make wire to the starter solenoid
4	white/black	tach signal	GREEN on the ECU
5	green	ignition switched power	PURPLE on the ECU
6	green/blue	water temp	make wire to water temp sender
7	white/brown	oil pressure	make wire to oil pressure sender
8	brown/yellow	alternator light	**not used
9	brown/black	N/C - ends next to gear box reverse switch	not used
10	white/yellow	goes to diagnostic plug	not used
11	white/blue	goes to diagnostic plug	not used
12	white/orange	goes to diagnostic plug	not used
13	yellow	fuel pump eavesdrop - Not used	not used
			* The blue/white wire is the Gear Shift light signal - earthed through the ECU. I'm going to wire the light later.
			** I may end up trying to wire this in anyway.  Right now I have no way of knowing if the Alternator is charging or not.
OTHER NOTES:
Lambda is not used at this time.  SBD may offer a Lambda and a new map in the future that would enable the system to run in closed loop mode.
Wire +12V battery cable to starter.
Wire the Post (output) of the Alternator to the +12v post on the starter (where the +12V battery cable connects)
I wired the ground (or earth) battery cable to one of the bellhousing bolts
There is a long wire on the engine harness that has +VBAT label on it.  Wire this to +12 side of the battery.
There is a thick brown wire with a black cover on it, ending in a ring terminal that is part of the chassis harness.  This gets connected to the +12V side of the battery.