87 dual tank prob

[Gordonr1973]

Your motors dying because the fuel pump isn't engaged.

With TBI, the switch isn't always on left or right like a carbed motor...it just should toggle left or right and then come back to it's resting position.

In these trucks, 99% of the time, black wires are ground.

The diagram 44th posted looks correct, post back to say if you've figured it out.

If you have access to a Haynes manual, buy one.