wiring

[john windowman]

hi guys got a problem you may be able to help with
my van a 2008 311cdi sprinter spun main bearings and just fitting recon engine
on inlet side the wires drop down under manifold these contain five plugs one to oil in sump three to intercooler pipe and I am stuck where other goes it looks to me like the smallest middle one in intercooler
thanks in advance for any help John