I have an 89 2.9 Ranger.

On the passenger side behind the battery, there's the fuse box. There are 2 relays behind the fuse box, and one relay in front of it. I know one of them is the fuel pump. I ask because I bought this truck and there's no relay in the socket in front of the fuse box (between the battery and the fuse box). If I unplug the other two relays the fuel pump does not kick on. Strangely I have to have both plugged in for the fuel pump to kick on, unless it doesn't kick on everytime I turn the key, which I thought it was supposed to. Can anyone tell me what these 3 relays go to?

 

Not sure if they will be the same but on mine 1 is the fuel pump, 1 is the WOT/AC relay and the 3rd 1 is the PCM.

 

Do you know if these relays are interchangeable? I bought a fuel relay thinking it might be bad, but the one that's on there is fine. With the truck running I pulled each of the relays and it died immediately when I pulled the PCM (I guess that's what it is), and ran it again and pulled the other, and it slowly died out, so I think that was the fuel pump relay. Can I stick this new relay I got for the fuel pump in the AC/WOT slot and it work or does it have to be a relay specifically for that?