I have a 89 chevy blazer s10 4.3 engine. I have a wire shorting. I know where the trouble is ,but i don't know what the item is for. The problem is a blue wire going to something i don't know what is. It's near the firewall in the engine one blue wire goes to it.It's almost on the transmission. It keeps draining my battery when the enging is off. I know it's not the oil sensor. Any ideas will be helpful.

 

get a picture, then we'll be able to tell you what it is.

 

Yeah we need the photo of it man, otherwise its like phoning a doctor and telling him your leg is sore, and whats wrong?