73 Harness Converted Into 87 Harness?

[TRokk]

I have a question, So I bought a new cab for my 73, I have a slight problem the previous owner of the cab cut all the wires short for the harness. I can still fix the headlights but Anyone ever Convert a 73 Harness into a 87 harness?

 

[marks86]

ive swap many harneses very easy to do, going from a 73-87 might be alittle more tricky my advice would be take alot of pictures or even get a doner truck, and park it right next to the 73

 

[chengny]

I don't know if you need these (or will be able to see them), but here are the wiring diagrams for the 1973 C/K 1,2 & 3 series trucks.

Engine compartment:

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Cab interior:

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