I have a 89 Isuzu trooper 4x4 with a 4-banger in it and I am a little stumped on a issue I am having. the trooper didnt run right from the get go due to a bad fuel pump and a rusted gas tank but a few weeks ago i replaced all of that and it ran great except for one issue. The blower motor for the air and alot of the gauge panel lights are lit up. Well i discovered that when I pull the blue relay from under the hood which I think is the engine relay, the lights go out and the blower motor starts working. The only thing is, this also deals with the charging system also. So I ordered this relay on ebay which it was a hard to find relay( # 8-94235-627-0) and it was used but tested with a warranty. I got it in today and pluged it in and its still doing the same thing. I am stumped now and dont know what direction to go. Maybe someone else might have a suggestion on fixing this issue because I has my puzzled