Originally Posted by F150xlt
The manual only says C100 is a 53 terminal connector that goes thru dash.
LH side.
Then yeah, it's that connector at the firewall I was talking about. It's where all the wires go from the engine compartment into the cab.
This info. is from the Electrical Vacuum Trouble shooting manual.
For the 88 F150-350 there were two Book type service manuals.
Truck Shop Manaul A and B.
You could also purchase the Electrical Vacuum Trouble Shooting manual
Engine Emission Diagnosis manual, Light Duty Specifications Book, Owners Guide and Schematics. The schematics I got were copies and if folded out are like 2ft x 2ft and very hard to decipher due to the way they label the pages. All of these documents were published by
http://www.helmsinc.com
The company is located in MI and publishes the service manuals for Ford and GM.
That explains it. I have manuals A and B, but not that troubleshooting manual. I'll have to see about getting that. It has been so helpful with my car.
Originally Posted by subford
I'll look for that. I'll bet there is one. It would be highly unusual if the wire itself went bad.