1990 Gmc P3500 5.7 Liter

[dannymailin]

Hey Mechanical Geniuses ...I bought a 1990 GMC 5.7 liter grumman olson in alberta..The truck sat for almost 4 years in a field..Previous owners story was that he got it converted to propane...propane quit working on him so tried to convert it back to Gas.. in the process of doing that he messed up a lot of wires..couple of wanna be mechanics looked at the truck and said its a hornets nest..lucky for me i found a guy driving one of the stepvans ...so i drove behind him for 10 blocks "real creepy"... he tried to avoid me but stopped..told him the story and he came and without a word for 2 hours he ripped out all the propane wiring...charged me 20 bucks for beer..(good samaritan)..anyways...he doesnt have a phone...hoping he would show up on the weekend like he said he would....i bought a fuel pump changed it but it doesnt wanna run..so i wanted to change the fuel pump relay..need help identifying the colors...i cut the old one out..will post pics in the morning..

[evil_diesel]

get a wiring diagaram for it. that's your best bet.