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Allfordmustangs.com has an article if you Web search your car with fuse 27 and 32 as part of the search. It blames the GEM as part of the problem(wiper) and also points out that the radio has several power feeds. Fuse 27 is hot all the time, but fuse 32 is only hot in ACC or Run. So as long as you can test fuse 32 to be hot in only Acc or Run, it should not drain the battery in Off position. You might want to test the ignition switch to verify it is really turned off.
The all mustangs article had different symptoms, as you did not indicate whether the fuses popped.
The wiper motor is suppose to derail and turn off. If you can unplug the wiper motor overnight and the battery stays up, you would know that it is either the wiper motor or wiper control. The radio is on the other fuse circuit. But whether the radio can drain a battery in a short time, you need to measure draw, but if the fuse pops, the battery should stay up. Again, disconnecting a circuit like a radio, and then having the battery stay up, would point to the radio circuit being at fault.
No way the radio can draw that much power even when it is left on. Check the trunk light. On some models the back seat will fold down.
Also disconnect the negative battery terminal. Touch it to the post and listen for a relay click, If one clicks find what it runs.
I think your radio is much like the one in a Taurus, and mine has had hiccups like that before. First locate the actual radio which is in the back somewhere behind a cover. Unplug it and wait a few minutes to be sure it is reset. Plug it back in and it should work fine again. This may also fix your navigation system, if it doesn't find the 'brain' of the navigation thing and unplug, wait a few minutes, then plug it back in.
It could be. A couple of ways to check: either take the negative battery off overnight or for 18 hours, and see if battery does not go flat-then you know you have a drain somewhere. Or you could remove all power to the radio overnight (by pulling radio fuses or unplugging the radio), then see if the battery has drained any.
Take the battery to an auto store. They have an amp meter to test it with. Check for poor connections at the back of the radio. If it's wired to a hot lead and not the ignition ( key on) or aux, my old cd player would turn itself on and run down the battery while parked. For me, bad radio.
When the battery was down or removed the radio was reset and since this is done for secuirty the codes must be entered on the panel for the radio to be active. Please check the manuals for the codes or call your dealerships.
If not try the link below:
If the battery is being drained by the radio,it is either hooked up incorrect,or the radio has a flaw in it causing the drain,have it repaired,or install another one.Any radio you want,a radio of any kind is fine,if it draws the battery down,then it is defective.
Dude, i had the same problem. I tightened up the relay from the positive terminal on the battery that sits right next to the terminal, i took off the negative and put it back on, and unplugged the wires that go from amp to speakers and plugged them back in. started working fine. It would be your best bet to reset the comp by taking off neg. and putting back on.