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I suspect the TFI module is bad. Could it cause a draw on the battery with the ignition off while sitting?

2007-09-02 01:52:20 · 3 answers · asked by Dave L 2 in Cars & Transportation Maintenance & Repairs

3 answers

disconnect the module and let it sit overnight and see if the draw went away , , connect a test light between the negative cable to the battery and the negative battery terminal ( remove the cable from the battery first ) if the test light is on , then have a friend start removing fuses 1 at a time , and see when the light goes out , when it does then that is the circuit that is causing the drain , then isolate the components that are powered by that circuit and see which one is causing your drain. NEVER SEEN A TFI MODULE CAUSE A DRAIN ON A FORD PRODUCT BEFORE . but this might be a first


it could be the alternator , and all you would need to do is follow the testing procedure that I gave you to verify if thats the problem , that way you dont spend any unnessary money , follow the procedure ( the test i mentioned earlier ) then remove the positve cable from the alternator , and the connector plug , and if the light on the test light goes out then , YES , it would be the alternator , but if the light on the test light stays on , then guess what ( ITS NOT THE ALTERNATOR ) listen, follow the test procedures like i said , and youll find the problem , but take guesses without testing , and I bet youll spend alot more money finding the problem .

2007-09-02 02:04:40 · answer #1 · answered by smogman 2 · 0 0

I'm with "John Paul" on this one.

If you have a bad rectifier (big diode) go bad, the alternator will charge the battery while the engine is running, but when you turn the key off, the blown rectifier will cause a short to ground through the alternator.

2007-09-02 02:27:06 · answer #2 · answered by Mr. KnowItAll 7 · 0 0

STOP BACK AWAY! check your alternator first. Ingnition module stops drawing the battery down when disconnected? I doubt that!

2007-09-02 02:06:16 · answer #3 · answered by John Paul 7 · 0 0

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