EEC Relay Help
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Senior User
Joined: Jan 2005
Posts: 274
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From: Pittsburgh
EEC Relay Help
EEC relay isnt relaying power to the fuel pump relay. If I jump the yellow to the pink/black truck runs normal.
Both relays are new, mystery 3rd relay guess a starter relay was also replaced with a multi purpose relay.
85 F-350 7.5L 460 - Dual tanks
Yellow - Hot (works)
Black - Ground (is grounded)
Pink/Black slashes - Comes from starter relay. It Y's off one end goes to the fuel pump relay normal wire, the other is the resistor wire goes to the EEC relay.
Red/Yellow slashes to back of engine EGR plate under carb or something like that..
Empty slot (unknown?)
2nd black wire in same slot as the Pink/black is cut and goes no place.
could be the red/yellow to the egr plate that not trips the relay? or the starter solenoid? or missing unknown empty slot? or the goto no place black wire?
Please help!!!
Both relays are new, mystery 3rd relay guess a starter relay was also replaced with a multi purpose relay.
85 F-350 7.5L 460 - Dual tanks
Yellow - Hot (works)
Black - Ground (is grounded)
Pink/Black slashes - Comes from starter relay. It Y's off one end goes to the fuel pump relay normal wire, the other is the resistor wire goes to the EEC relay.
Red/Yellow slashes to back of engine EGR plate under carb or something like that..
Empty slot (unknown?)
2nd black wire in same slot as the Pink/black is cut and goes no place.
could be the red/yellow to the egr plate that not trips the relay? or the starter solenoid? or missing unknown empty slot? or the goto no place black wire?
Please help!!!
Post Fiend
Joined: Jul 2004
Posts: 8,786
Likes: 28
From: Northern California
Alright, what you are dealing with above is the Fuel Pump Relay, not the EEC Relay.
I'll explain step by step what the wires do.
Above wire comes from the Inertia Switch, and from the inertia switch goes to the starter relay. If this is working normally, then the inertia switch isn't tripped. Good.
Correct, this is ground wire.
This is wrong. This wire powers the fuel pump. The wire comes from the fuel pump relay, goes through the resistor (.750-.030) ohms, and goes to a WYE at the connector. One end hooks to the Starter solenoid, (Starter side) and the other end goes to the fuel pump, or Fuel tank selector switch. The connection at the starter solenoid is the fuel pump relay bypass for starting.
Red/Yellow slashes to back of engine EGR plate under carb or something like that..
This is somewhat correct. It actually comes from the fuse Panel. (F-2) Goes to a splice (S-404) where it wyes off and one goes to the carb like you said, and the other goes to and through the Oil Pressure Switch, where it continues to the fuel pump cutoff relay.
It's just that, Empty.
This is also correct, Circut 48 terminates in the harness according to the diagram.
hope this helps.
I'll explain step by step what the wires do.
Yellow - Hot (works)
Black - Ground (is grounded)
Pink/Black slashes - Comes from starter relay. It Y's off one end goes to the fuel pump relay normal wire, the other is the resistor wire goes to the EEC relay.
Red/Yellow slashes to back of engine EGR plate under carb or something like that..
Empty slot (unknown?)
2nd black wire in same slot as the Pink/black is cut and goes no place.
hope this helps.
Thread Starter
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Senior User
Joined: Jan 2005
Posts: 274
Likes: 0
From: Pittsburgh
Man its hard to accept this isnt the FP .. lool
Hayness has the EEC relay as so, and nothing about the FP relay:
None of my relays look like this..
What im thinking is or was the fuel pump rely has:
anyway the sun has gone down here.. working in the driveway is done for the night..
thanks for your insight.. ill see if i can get a part number off the one relay thats original to the truck.
Hayness has the EEC relay as so, and nothing about the FP relay:
Code:
red lt grn/black red/blue yellow
What im thinking is or was the fuel pump rely has:
Code:
----------------------------------------------- Pink/black slashes - power to relay from the other relay Red - brown/white stripe - when jumpped powers rear pump, but has loops out and to the tank selector switch (unsure) Orang/blue - when jumpped powers front pump And what im thinking is or was the ECC relay Yellow - hot Black - ground Pink/Black slashes - power to other relay Red/Yellow slashes - EGR plate ------------------------------------------------
thanks for your insight.. ill see if i can get a part number off the one relay thats original to the truck.
Thread Starter
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Senior User
Joined: Jan 2005
Posts: 274
Likes: 0
From: Pittsburgh
Ok, working in the dark now.. remove all the wires from the oil pressure switch and EGR plate (if thats whats its called) behind the carb. cleaned everything up tested everything with a self powered test light and hooked everything backup nice and neat. didnt work.. then jumped the 2 prongs from the EGR plate and like magic clicking from the relays. dont know if I have the right relays plugged into the right places or not (they all have the same 5 prongs), but atleast its working.
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