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Repair guides and support for the fourth generation of Ford Mustang, including the Mustang GT and Mustang Cobra.

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Why is my Battery Draining

If I don’t start my 04 Mustang Mach I in two days, the battery is dead. Pulled individual fuses, no problem. Pulled the #6 High Currency Fuse (located by the battery) and the draw stops. #6 controls the Powertrain Control Module (replaced with a reman with plug and play), I/P Fuse panel and Instrument Cluster. I’ve called three Ford Dealerships and Ford Motor Company who could not provide me with any information as to what the I/P Fuse panel is or where it is located in order to determine if there is a short. Can you help?

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That seems to be a common problem with those Ford's.

You could install a kill switch until you can pinpoint the problem.

I will look around on the Stang forums for an answer.

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Thank you I have look at some stang forums, but no luck on my end

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Ok try this: Check battery voltage while car is running. It will probably be around 12v or 12.5, it is not charging at this rate.

Connect a grounding wire (#4 copper) to the bracket of the alternator and to the negative post of the battery and check voltage again, now you should read 14v or better and the battery is now charging correctly. If this works make the connections permanent and secure the wire in several spots.

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I understand what you are saying and the battery is charging correctly. The drain in the battery is when the vehicle is not in use. What is confusing is when I pull the #6 high currency fuse the draw stops, but the odd part is when I use a test light to both the terminals on the #6 fuse block, it shows no current at all. When I put the fuse back in, the current again flows thru the fuse. This is confusing. Thanks for you answer though.

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Can you read the amount of voltage?

Sometimes it can be a glovebox or trunk/hood light not turning off but I

assume you checked those things.

You're problem is with a light that can be on without the key being in the on position or the engine started. Trunk, hood, glovebox, dome light or a dead short in one of those circuits.

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When you put the fuse back in, there is a current drain, when you test with your test light, the bulb does not light up as the drain is so small that the bulb will not show any illumination. Use your AMP meter and test the amount of current drain then let us know, you will need a good wire diagram to trace the problem, we can help if anybody has a diagram to share.

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OK I will try both what Michael posted and you Duane. I have the actual Mustang Mach I manual that should show a wiring diagram. I will let both of you know.

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Stony さん、ありがとうございました!
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