74 k10 tail light new rewire

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prodigy2000

Junior Member
Joined
Nov 16, 2025
Posts
1
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Location
california
First Name
Brady
Truck Year
1974
Truck Model
k10
Engine Size
350
Hi, I bought a new tail light harness going to the firewall and in the rear going to each light, etc. The picture below I have two plugs to splice my new harness to. One on the right has three green wires, is one of those just an extra ground? Or should I stick with the other plug with only 4 wires.

Other picture is the new harness diagram I’m going off of.
Last picture is my harness coming from the chassis so I’m not worried about those plugs just the female end plugs in the first picture I talked about.

I’m also adding a trailer plug if anyone can help me there. Thanks
 

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