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Hi, I bought a 1989 f-150 XLT Lariat 5.0 I have been going thru it, working on anything that I find that needs work. There were 2 relays laying on the drivers side fender in the engine compartment. After some research I figured out that these are the Fuel and the EEC relay. The Plugs that the relays plug into and the relays were all badly corroded. I found new plugs with pigtails online and spliced them in. I also ordered 2 relays. I got one from auto zone and the other online. When I looked at the little diagram on the top of the new relays, they (functionally) looked identical. So this means either they are identical, and just carry different part numbers, or one of them is the wrong relay. Does anyone know if these relays are in fact the same? And if not how can I tell which one is the wrong relay.
Thanks in advance for any help anyone can offer.
Glenn
The green one (fuel) and the grey one are not the same
Neither is the brown one the same (the connectors have different dead lineup posts)
With different connectors you can make any of them work
Get yourself a new little black plastic box that holds them right side up to lessen the corrosion
Here are the Pigtails and relays I bought. One was purchased as a fuel relay the other from another source as a EEC relay. when I took the pics I had not yet heat shrunk the pigtails.
I found this after some digging on the part # of the relay (It turns out there are different numbers from different stores) I found this from a place called Summit Racing https://www.summitracing.com/parts/S...-size/5-0l-302
This website was the most informative and easy to use that I have come across so far. Based on this I'm going to try the relays and hope it works out. Now I have to find the plastic holder so they don't lay on the fender.
Also, sorry the pics are so huge, I don't know how to fix that. It took me a while just to figure out how to upload them. Thanks to both you guys.
The one on the left, marked 23170, has a diode in series with the coil of the relay. It should be the ECM relay.
Diodes prevent current flow in the opposite direction of the arrow looking part of the symbol.
The one on the left, marked 23170, has a diode in series with the coil of the relay. It should be the ECM relay.
Diodes prevent current flow in the opposite direction of the arrow looking part of the symbol.
Wow! thank you very much! I have much to learn about this.
yup. besides the diode, those relays are the same.
the only difference is the one on the left can only be hooked up one way with #1 being negative and #2 being positive.
the relay on the right can be hooked up either way.
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