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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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Old 01-10-2013, 10:26 AM
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MrFixitND MrFixitND is offline
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1988 F150 wiring diagram?

Hi,
I am working on an '88 F150 for my neighbor, it had a fire under the hood and I am trying to repair/replace some of the wiring... Anybody know where I can find a good wiring diagram and/or service manual for this truck? Thanks!
Andrew B.
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Old 01-10-2013, 11:40 AM
88n94 88n94 is offline
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The Haynes repair manual I have has seven pages of wiring diagrams. Labeled 1987 through 1989 F-series/Bronco wiring diagram. Haynes manual number 36058, covers 1980 to 1996. The wiring diagrams look clear, but I am not good at reading wiring diagrams so I can't say how good they are. I suppose they are copied from a Ford service manual.
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Old 01-10-2013, 03:19 PM
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You can get some diagrams here for free: BBB Industries - TSB's & Wiring Diagrams
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Old 01-10-2013, 06:46 PM
9inchlift87 9inchlift87 is offline
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You can find a list of repair manuals and electrical trouble shooting guides on Amazon. Just go under the book section and put in the year and make (1988 Ford F150 electrical troubleshooting manual) along with model. I got a copy of a actual service manual that covers the component, testing, and a schematic of that component. Cost about $25 and it came in about 3 days. It gives you wire colors, connector locations, and some testing procedures. It has helped me find a bad ground for the horn, a bad door lock actuator, and am now checking the vacuum lines to make sure they are all intact. Hope this helps. Good luck.
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Old 01-11-2013, 07:14 AM
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The Ford Electrical & Vacuum Trouble Shooting Manual is not that good for detail work and has a lot of errors in it. This also goes for the Haynes repair manuals.

The only error free prints you can get for that truck is the one below. That is the one everybody copied for their manuals and ford used to make the Truck in the first place. And it is only $19.99.
Ford 1988 Truck Wiring Diagrams Bronco F150 F350 F Super Duty 11"x17" Foldouts | eBay

Click the image to open in full size.

/
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Old 01-13-2013, 11:47 AM
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Help!
Found this picture online, and highlighted a couple of things. Can someone please tell me what the module is in the circle, and where else the wires in the harness i highlighted go? These wires are all melted/broken/cut off on the truck I am working on, and I don't know what they are supposed to connect to...

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Old 01-13-2013, 01:02 PM
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Looks like the MAP sensor to me. The signals eventually make their back to the PCM itself.
Click the image to open in full size.
courtesy of oldfuelinjection.com

The Manifold Absolute Pressure (MAP) is illustrated at the center-bottom of the schematic above. There should be a vacuum line running to it as well as a 3 pin connector.
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Old 01-15-2013, 10:29 AM
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Yep, appears to be the MAP sensor... Thanks! Anybody know where the other wires go in that branch of the harness? I found a Haynes manual at the local library, but that is not much better than nothing... Although the wiring diagrams may be helpful...
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Old 01-15-2013, 10:29 AM
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