yo! Do you have this
Chilton diagram?..it's for an 87, but could be same as your 86
by datrimm (HiTechRedNeck) "Also; the fusible link is a wire looking thing over between the battery and inside fender wall. it should hook to the starter relay. make sure you find the right color according to the diagram. if it's blown the black covering on the link should be burnt, that means it's blown. like a fuse, but it burns up instead of breaking, and it's not in plastic. on the diagram the fusible link is between transmission controls and the fuel injectors, at the top. you follow that down to the fuel pump relay, and then to the intertia switch, then it splits and goes to the in-tank pump and the frame rail pump
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also, if you had corrosion in your relay socket, then you probably have it other places. one at a time unplug all relays and connectors on that fender and spray them down with contact cleaner. then after you let that do it's job for about 30min-1hr, go back and unplug each relay and connector again (one at a time) this time put them together with di-electric grease. you can buy a tube of it from any electrical/electronics supply or auto store. make sure you get everything plugged back in... see if that helps...
another thought, you said you checked the voltage to the relay, but the relay actually has two power inputs. one to power the magnetic coil, the other goes to the fuel pumps. the one that goes to the fuel pumps has a fusible link on it. if it's blown, no power will ever get to the pump until it's replaced...
here is a diagram:"
dunno if this is same for your 86....sorry, aving a poor ISP connection today..
so, I can't switch browser windows good enought to compare all these color codes or wiring diagrams...Relay Overview & Diagrams
Source: by Ryan M (FireGuy50)
Fuel Pump Relay Operational Sequence; The computer turns on the fuel pump relay 1. For about 2 seconds when you first turn the key to ON and 2. when it senses rotation in the dizzy from the pickup.
Source: by Will H (kf4amu, The Beast)
"...An electromagnetic operates the relay with minimal draw threw the switch. Relays are used in fuel injection to make computers cheaper and more reliable. The main computer has many jobs to do and can not do them alone. The computer sends small amounts of electricity to the relays which then control the high demand devices. Below are the internal workings of a basic relay...) (see his site)
Fuel Pump Relay Swap to Bosch Type in all pre-'92 EFI Bronco & F-series
Source: by Steve83 (Steve, That dirty old truck)
Although you have no power to the Inertia Switch; figure i'd throw this in anyway...."...The Inertia Fuel Cut-Off Switch is a relay of sorts, so it gets to be on this page. This little relay is in your car to save your life from fire by shutting off the fuel pump in the event of an accident. It cuts the power to the fuel pumps when a pedetermined force is applied. Just like a circuit breaker the red button pops up when it is tripped. It consists of a steel ball held in place by a magnet. When a sharp impact occurs, the ball breaks loose from the magnet, rolls up and strikes a target which opens the electrical contacts of the switch and shuts off the electric fuel pump....)
Fuel Pump Relay Socket Corrosion Info; also, if you had corrosion in your relay socket, then you probably have it other places. one at a time unplug all relays and connectors... and spray them down with contact cleaner. then after you let that do it's job for about 30min-1hr, go back and unplug each relay and connector again (one at a time) this time put them together with di-electric grease. you can buy a tube of it from any electrical/electronics supply or auto store. make sure you get everything plugged back in
Source: by datrimm (HiTechRedNeck)
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