Fuel pump relay
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Senior User
Joined: Dec 2003
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Fuel pump relay
Can someone tell me how many wires go to the relay?87 F250-460 carbureted.I can see 4 wires and I found a yellow wire that has corroded off and it looks like it also belongs in the connector.Any idea what the yellow wire is for?
TIA Will
TIA Will
Logistics Pro
Joined: Jul 2003
Posts: 3,595
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From: Lawton, Oklahoma
Im looking at an 86 book for the 7.5L and I see a black, next to that a red and yellow, next to that Pink and black (two wires) and then a yellow which is on a pin in a different row turned sideways from the others. Hope I made that clear enough.
New User
Joined: Sep 2004
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Pump Relay
The yellow wire is connected to the block that goes into the relay there are two wires that are positioned different than the other three prongs. It goes on the one thats missing . You can buy new crimp on terminals at NAPA auto stores. Ps its hot all the time the key is on so be careful!
New User
Joined: Sep 2004
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pump relay
Actually ive found that they dont usually burn off or thats my experience with them the wire breaks( lots of experience on that wire at those relays) im not sure why but it does on my 88 dually ive had several pump relay problems and its usually the wire breaking off.
New User
Joined: Sep 2004
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I have been working on a problem with juice to pumps and when I was checking out the pump relay the yellow wire on mine is a constant hot which gives juice to the inertia switch hope this helps you in your repair also I dont think the truck would start without the yellow hookup
