87 V10 Wiring

[Jason S]

Hello all. Finishing up build on 1987 V10 4x4 350 TBI. This was an abandoned project so I might be missing componenets. A two wire connnector on passenger side with pink/black [439] and dk green/yellow [428] wires not plugged into anything and there is nothing within its reachable range that I can see that it would plug into. Truck has headers, no pollution pump, aftermarket aircleaner, aftermarket a/c, dakota gauges. Need to know what this connector would go to. The wiring diagram I have says the [439] goes to IGN 1 PWR INPUT and the [428] to Cannister Purge.

On the driver side, I have a connector with a single greenwire, and a two wire connector with both wires going into it are green. Same question, not sure if I am missing a sensor or component. I cant find either of these connectors on my wiring diagram.

Thanks, Jason

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[CalSgt]

I would eat the green wires were factory A/C

 

[Zelph]

Isn’t the single green wire for a tach signal?

 

[Jason S]

Isn’t the single green wire for a tach signal?

Thats a possibility. Ill check that, I have dakota gauges including tach and its possible they have their own wire for the tach. My Dakota tach is working so maybe thats the leftover factory tach feed. Thanks.

 

[89GMCJimmy]

I wanna say the single green dr side is temp on my 89' 350 TBI

 

[Edelbrock]

Aside from not knowing where that wire goes, is there any reason to find out where it would go? If there are no symptoms of a problem, then I would have a beer and call it a day. Vehicles sometimes had extra wires on a harness because that model uses the same harness as a model that has more options. So the extra plugs are just ... extra. For example - Its easier to make and install a wiring harness that works for A/C and non A/C cars and install that same harness on all the rigs. So the rigs without A/C have extra plugs that are not used. So a rig might have plugs for fog lights, even though the car doesn't have the fog lights, relays, or switches to activate them. Build 1 wiring harness that covers everything or build 23 different versions of the harness without knowing exactly how many units of each type will actually be needed.