CS121 harness

[elf w/capital T]

hello! I converted to a serpentine setup a while ago... got a brand new replacement CS121 alt. ( P-L-F-S) on harness. the harness I took off the old one (from junkyard) just has the brown wire ( *F* position) and nothing else in the harness.

I plan on installing the AAW Classic Updates kit and my question is.... do I NEED the original wiring P-L-S as well? I know I can buy the new harness... but isn't the brown just for a light or something? (not sure where on the cluster it would be)


Electrical is not my strong point and I have done some research and found that my new alt ISNT the cs130 I thought I got and everyone elses harness have a fat red, two browns and a grey wires.....

any help would be greatly appreciated.