FASTSHOMTX92
New Member
I have 92 mtx and since i replaced my tranny , something is draining my battery over night and it is ******* me off, no it is not a defective battery trust me. I was just wondering if anyone has any ideas.
I need to fix this f..in problem now
- Thread starter FASTSHOMTX92
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BlackOnBlackATX
New Member
thats something pretty tough to trouble shoot, but it may be something in your primary starting circuit since that closest to the battery. do you have an aftermarket amp by chance?
SHO_Driver
New Member
Disconnect the negative bat cable. Touch it to the post, does it spark? If it does this indicates an excessive drain while the car is off. You could then pull a fuse then reconnect the negative checking if it still sparks. Do this for every fuse until it doesn't spark, then you've found the shorting circuit.
What you can do is just hook an amp meter between the positive battery post and the battery cable. If you see it's registering that current is flowing, keep pulling fuses until the meter goes down. When it does, you've isolated the circuit. One thing I've heard of is the mercury switch for the underhood light. If it gets turned the wrong way, the light will come on when the hood is shut. Check those two things out.
Doug
Doug
rangerj
Active Member
Fast SHO,
As posted above, something is drawing current. Tha "amp draw test" described above is the best way to go.
When you open the hood you will be getting an amp draw from the under hood light, because the light is on, DAH!
Unplug the light or remove the bulb. Check for an interior light, such as the glove box light, that is on. Check the trunk.
If the source of the amp draw is not obvious, then start pulling fuses, one at a time, until you find the fuse that stops the amp draw.
Check your vehicle for any time delay devices, such as an alarm, interior lights, etc. While the timer is activated the battery will have an amp draw until the delay device shuts off. Then you can proceed with the test.
Stay connected the whole time so you can tell the difference between the time delay device and the item that is draining your battery. Sometimes it is the time delay device that is draining the battery because of a stuck relay.
I once found a dime down in the bottom of the cigar lighter that was draining the battery.
If it is not something obvious, like the under hood light, then it is a shorted or grounded connection, or a stuck relay.
These can be as simple as replacing the glove box light switch, or can be a hair pulling experience. I hope yours is the former. rangerj
As posted above, something is drawing current. Tha "amp draw test" described above is the best way to go.
When you open the hood you will be getting an amp draw from the under hood light, because the light is on, DAH!
Unplug the light or remove the bulb. Check for an interior light, such as the glove box light, that is on. Check the trunk.
If the source of the amp draw is not obvious, then start pulling fuses, one at a time, until you find the fuse that stops the amp draw.
Check your vehicle for any time delay devices, such as an alarm, interior lights, etc. While the timer is activated the battery will have an amp draw until the delay device shuts off. Then you can proceed with the test.
Stay connected the whole time so you can tell the difference between the time delay device and the item that is draining your battery. Sometimes it is the time delay device that is draining the battery because of a stuck relay.
I once found a dime down in the bottom of the cigar lighter that was draining the battery.
If it is not something obvious, like the under hood light, then it is a shorted or grounded connection, or a stuck relay.
These can be as simple as replacing the glove box light switch, or can be a hair pulling experience. I hope yours is the former. rangerj
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