I think the one at the top of the bracket is for the fuel pump and the shinny one is for the injectors but whats the last one and what does it do?

and what does the one for the injectors do, shouldn't they just be ground?

-John

 

The injector relay has a set of resistors in it. They are needed for the peak and hold injectors. If you run Bosch or similar saturated injectors, you have to modify it to eliminate the resistors from the circuit.

 

What is the one under the resistors for the injectors, the one that looks like a heat sink.