Open electrical circut battery going dead after several day
An open circuit will not kill a battery "open" means that the switch or wiring is disconnected. What you are looking for is something remaining on. Do a quick check to make sure that with the car off, no glove box, dome or courtesy lights (including trunk or under hood lights are remaining on (brake lights too). No tests are valid unless the battery has been fully charged and load tested, so, do that.
Once you are ready to test, you need to install an ammeter between either battery lead and the battery. The meter will show draw. Then pull each fuse 'till the draw substantially diminishes (don't forget, testing with the door open will give you a reading from the dome light etc). The fuse that you pulled when the draw dropped is the circuit that is staying on.
Then, with the fuse back in,you will need to begin unplugging items served by that fuse (fuses often serve more than one item) till the draw again disappears.That is the item causing the problem. Be aware also that an alternator can sometimes develop an internal fault which will cause draw but sometimes not noticeably affect charging. So, if you have pulled all the fuses and did not find the problem, that's a good place to look.
Doing electrical diagnosis takes time and patience If you don't have either, have a reputable shop do the work. Also, anything having to do with the somewhat larger, bright yellow wire under the dash, leave alone. If you do anything with that wire you can deploy the airbag system (bad)
Hope you find the problem quickly!
Apr 09, 2010 |
1995 Chevrolet Monte Carlo