parasitic drain
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parasitic drain
2004 F150 5.4. Battery dead after 2 days. Tried to start and the fuel pump starts clicking, and will not turn off when the key is removed. Tried the amp meter fuse, relay pull test, both in cab and under hood. No luck.
Disconnected alternator and fuel pump driver. Still draw. Connected test light to negative terminal to negative cable and the light would flash and the fuel pump would click. The head lights would turn on for a second
when I reconnected the negative cable. Any ideas would be appreciated. I have lost faith in my skills.
Mike
Disconnected alternator and fuel pump driver. Still draw. Connected test light to negative terminal to negative cable and the light would flash and the fuel pump would click. The head lights would turn on for a second
when I reconnected the negative cable. Any ideas would be appreciated. I have lost faith in my skills.
Mike
Cargo Master
Joined: Jul 2009
Posts: 2,538
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From: Des Moines
By “fuel pump clicks” do you mean the fuel pump relay clicks? And which relay(s) did you do the “pull test” on (not sure what you mean by pull test)?
The fuel pump relay receives its power from the PCM power relay which is engaged once the ignition is in start or run. If the FP relay is clicking on and off repeatedly, pull the PCM power relay and see if it stops - both are in the engine bay fuse box.
The next steps depend on if the FP relay stops clicking with the PCM power relay removed.
The fuel pump relay receives its power from the PCM power relay which is engaged once the ignition is in start or run. If the FP relay is clicking on and off repeatedly, pull the PCM power relay and see if it stops - both are in the engine bay fuse box.
The next steps depend on if the FP relay stops clicking with the PCM power relay removed.
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