i have a 1989 b150 ram van 3.9 map sensor wire coming off harnes near motor has 2 wires soldered to the map sensor wire was this factory or someone handy work cant find a diagram of motor harness going to sensors and tbi im having a issue with only pass side injector firing driver side wont fire anyone have a engine harnes diagram thanks

 

Might find wiring diagrams here..... Given the age of your truck though, I'm not sure....

I seriously doubt the factory soldered in any wires to sensors......

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