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My 318is 1995 drain the battery and wont start i bough a new battery and it did not solve the problem,i disconected the battery terminal and the car continue running and i took it to the shop and the did a diagnostic test on it and did not find the problem, now i have to jump star the car every morning, i need help to solve the problem can you help with this problem
Disconnect the negative battery terminal, using a 12v test light put one end on the battery terminal put the other end on the cable if you have a draw the light will light up, go threw and disconect one fuse at a time until the light goes out, notice the fuse you pull out when the light goes out that the circuit that you have your short or draw in good luck
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try a tester on the alternater when the car aint running or if you have recently fitted a radio maybe you got the wires wrong way round and its on power all night
Might be anything, but before going further I wish to check and clear three most common factors: There are 3 most common reasons for the battery to drain. You have to check these one by one. A bad charging system. Start the engine, and with a mulltimetr, or Volt/ Ohm meter, set at 20V DC, measure the voltage between terminal (+) at the battery, and a good ground. The reading should be 13.8 V to 14.2 V. If this is O.K then you have to check the battery. Stop the engine and check the voltage between the (+) and (-) terminals of the battery. If the voltage is 12.6Volts than the battery is fully charged. If it is 12.45Volts the battery is 75% charged and so on. A bad battery is not able to hold the charge anymore, and need to be replaced with a new one. The third reason is a phantom voltage leak. This is a parasitc electrical drain on the battery, because a relay is sticking, a module is not shutting down, or there is a shorted diode in the alternator. To check this you need a bulb 12V 1 Amp, connected with two wires and two alligator clips. Disconect the harness from the positive terminal of the battery, and connect the bulb in serial, with positive terminal of the battery, and with positive harness of the car. Make sure to create solid contacts with aligator clips. The car electrical system hates sparks, which you have to avoid. As soon as you connect the bulb, the system might sink up to one Amper of electricity. This happen because the modules and computer starts learning, but soon the courent will decrease in milliamps. If not then you have parasitic electrical drain on the battery.
Remove Negative terminal first, then positive terminal. Battery will have some type of tie down or block at base with a bolt you will have to remove. Remember how it goes back together. Remove battery.
Install new battery and tie down or block. Install Positive terminal then Negative terminal.
Remember to never touch both Positive and negative terminals with a metal object (ie..ratchet, wrench etc) this can cause injury and/or permanent damage to a new battery.
disconect battery +terminal then loosen top bolt on you alternater so you remove fan belt, then undo elcrtics from the back then take top bold out remove the bottem one also refit new one in reverse >last re conect you battery back up
disconect the batterie cables and scratch and clean very wheel even if they look ok and make sure any aftermarket alarm is disable and even if batterie looks good try to jump start the van
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