On my stock 1987 LG4 Formula there is a relay (I think) attached to the passenger side fender right next to the battery. It has a plug with some wires that plugs into the square relay that is attached by one screw to the inner fender. Does anyone know what this is? I was at the junkyard and cut one off of a 1990 305 TBI car and it is a little bit different. It has two wires going into it with a 20 amp fuse in it. Could I change the relay set up in my 1987 over to the 1990 set up?

Thanks for the help.

 

if i'm understanding you correctly, you are referring to the fuse that is less than a foot from the battery mounted to the passenger frame/fender rail. It is a fuse that directs power to your ECU (and fuel pump relay on fuel injected cars). Should be a direct swap, i don't understand why they would have changed them at all, but a simple fuse holder of the same guage wire will be a direct swap. Just be sure to seal the crimps that you make with either a shrink cover or something similar to keep moisture out, as you don't need a short to your ECU.