wiring harness routing on top of rad support ?

[Rfuller102]

I just finished rebuilding radiator support on my 87 f350 6.9
battery cable runs in indent on top of rad support I believe, Question is What is the correct routing of headlight harness?
Any other wire routing information (pictures of tidy engine bay or factory routing illustrations) would be much appreciated

 

[Nero]

It routes under the top lip of the core support, forward of the radiator. There's little christmas tree hanger things that hold it in place.