More wiring nightmares.
Thread Starter
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Freshman User
Joined: Mar 2002
Posts: 48
Likes: 0
From: Lafayette
More wiring nightmares.
Again it is my 85 F150 inline 6. I have a short in fuse #18, which drains the battery. Did the test with the test light and the battery cable removed. Pulled the fuse, no problem. The owners guide says that #18 is the seat belt warning (no big deal always wear them). My haynes manual says that #18 runs:
Low Vacuum Warn Sw
Water In Gas Sw
Diesel Warn Ind Module
Fuel Pump Oil Pres Sw
EGR Vacuum Sw
Carb Bowl Vent Sol
Extended Use Life Sens
Inst Clstr Pins A1 & A13
Boy these really look important, would any of these contribute to rough idle,dieseling after engine turned off. Can anyone expand
the abbreviations. I am assuming Sw=switch and Sol=solenoid
Separate question. Running accross the top of the engine in the
black wiring harness tube, I have 4 stiff wires with rubber/plastic
push on connectors. The colors are black/red/yellow/orange. Orange
appears to connect to the EGR valve, red to the smog pump or alternator, black over by the passenger fender and yellow is broken
off. What does yellow do?
Thanks for all help, sorry for the long post.
Low Vacuum Warn Sw
Water In Gas Sw
Diesel Warn Ind Module
Fuel Pump Oil Pres Sw
EGR Vacuum Sw
Carb Bowl Vent Sol
Extended Use Life Sens
Inst Clstr Pins A1 & A13
Boy these really look important, would any of these contribute to rough idle,dieseling after engine turned off. Can anyone expand
the abbreviations. I am assuming Sw=switch and Sol=solenoid
Separate question. Running accross the top of the engine in the
black wiring harness tube, I have 4 stiff wires with rubber/plastic
push on connectors. The colors are black/red/yellow/orange. Orange
appears to connect to the EGR valve, red to the smog pump or alternator, black over by the passenger fender and yellow is broken
off. What does yellow do?
Thanks for all help, sorry for the long post.
Senior User
Joined: Jan 2001
Posts: 326
Likes: 0
More wiring nightmares.
In answer to your first question:
the Hanyes manuals use the same wiring diagrams for all engine configurations (I6, 302, 351W, 351L, 460, and diesel), therefore not all the things controlled by fuse #18 are going to be present on your I6. You need to be sure which components are actually on your motor. Haynes ussaully will put in notes to say if a component is specific to a certain engine ,ie: your engine definately isn't going to have a "Diesel Warn Ind Module" or a "Fuel Pump Oil Pres Sw" both are specific to diesel motors.
Your second question:
I think if you check, you'll fiind that the "stiff wires" are acually vacuum lines if I remember correctly (specific to I6 motors with Feedback Carbs). If they are the vacuum lines I'm thinking of, then the broken yellow may be the problem with your rough idle and dieseling.
the Hanyes manuals use the same wiring diagrams for all engine configurations (I6, 302, 351W, 351L, 460, and diesel), therefore not all the things controlled by fuse #18 are going to be present on your I6. You need to be sure which components are actually on your motor. Haynes ussaully will put in notes to say if a component is specific to a certain engine ,ie: your engine definately isn't going to have a "Diesel Warn Ind Module" or a "Fuel Pump Oil Pres Sw" both are specific to diesel motors.
Your second question:
I think if you check, you'll fiind that the "stiff wires" are acually vacuum lines if I remember correctly (specific to I6 motors with Feedback Carbs). If they are the vacuum lines I'm thinking of, then the broken yellow may be the problem with your rough idle and dieseling.
Thread Starter
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Freshman User
Joined: Mar 2002
Posts: 48
Likes: 0
From: Lafayette
More wiring nightmares.
Thanks, for the info. closer inspection shows that many of the items listed are for diesel only. That drops the number of wires to trace
significantly. My Haynes manual specifies diesel engine only for those.
Secondly, I think you are right. I think those are vacuum lines,
They are very small. Does anyone know what the tiny yellow vacuum line is for?
significantly. My Haynes manual specifies diesel engine only for those.
Secondly, I think you are right. I think those are vacuum lines,
They are very small. Does anyone know what the tiny yellow vacuum line is for?
Thread Starter
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Freshman User
Joined: Mar 2002
Posts: 48
Likes: 0
From: Lafayette
More wiring nightmares.
Thanks for all the help, I consider this topic closed.
The yellow tube is a vacuum line. Ford Dealer says computer tells to just replace with standard vacuum line. And 'DUH' it is right on the vacuum diagram right at the front of the truck. Green goes to EGR and
yellow to Carb. Yellow is the one that is broken off.
The yellow tube is a vacuum line. Ford Dealer says computer tells to just replace with standard vacuum line. And 'DUH' it is right on the vacuum diagram right at the front of the truck. Green goes to EGR and
yellow to Carb. Yellow is the one that is broken off.
