Question about 1997 Ford F150 Regular Cab
I have a 97' f150 4.2 eng 2 wheel drive pickup. About a mounth ago it quit running while my wife was driving it as if the key was turned off. I replaced fuel pump thinking it was an easy but exspensive fix, no starting just cranks. So I began my endevor of testing and found that when the key is turned to the run position that the maxxie fuse in power disterbution box blows. Its the one fore the ecm. It wont blow if the relay top right is removed. I have unplugged every thing in the engine compartment still has a dead short at the ecm fuse when key is tuned to run position.I had the fuse box out of the cabbin area and couldnt see any burnt or rubbed through wires any where. please help
A fuse blown is a short, and a short is a ahort.
The fuse is the ecm so unplug the ecm and see what happens. If the fuse holds with theecm unplugged, then it is your ecm that needs relacement. If it still blows, The short is in the wiring.go to the parts store and pick up and automatic circuit breaker. It plugs in where the bad fuse goes. It will trip and reset itself automaticallly like a flasher until you have located the short. trick, Start with a breaker of amp. examole; if you took out a 20 amp, put in a 10 amp so the breaker trips faster, On and off quicker so you don't have to wait between ressets. If you want to trace the short by the wiring, put a 25 amp or with great caution a 30 amp. That is the limit. The wire will get warm on the 25 and even warmer on the 30. Pay attention that the wire does not get hot. Hopefully yhe 25 will get the wire warm enough for you to follow. Good Luck, Ned. This method is dangerous if you don't pay very close attention using the high amp breaker. There is a risk of fire if the circuit cannot handle 30 amps. In fact, only yuse the 30 amp breaker if the 25 breaks and resets too fast. Good Luck_Ned_
Posted on Oct 04, 2009
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Posted on Jan 02, 2017
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