Hey Fellas, I just bought a 1988 Ford F-150 with a 4.9L 5 speed, and It has this crazy electrical problem. I knew that the truck wouldn`t run before I bought it, but the price was right ($500.00) with 118,000. The truck will not start and has weak spark. The distributor module has been replaced with no luck. If I leave the key in the "On Position" the fuel pump will run erratically, and the fuel pump relay "clicks" very quickly and erratic. Under the washer bottle, there is a wire harness that runs under it, and branches off on top of the left front wheel well with 3 connectors. The biggest connector with
12 pins (roughly) was corroded. I cleaned it, and still no luck. So then I inspected the other two connectors that are right next to the 12 pin connector, and they appear ok. Is there a common break in the harness? In that harness, is the wiring for the coil/distributor/and fuel pump together? Visually inspecting the harness, it looks ok. The truck seems to "flood" from cranking because the fuel pump is always energized. Smoke does come out the tail pipe, so there is little spark. I`d like to get this old girl back on the road. It has been sitting about a year. Thanks to anyone who can help!...mfat