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Tracking down a parasitic draw
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<blockquote data-quote="L-Bronco" data-source="post: 16731504" data-attributes="member: 203053"><p>Hi, The most effective way to track down a parasitic loss in a car is by measuring the voltage drop across the fuses. If there is current flow through a fuse, the voltage on the supply side of the fuse will be slightly higher than the protected side. (A fuse uses a bit of current while its load is on, and it warms up a little. If the current gets too high, it will melt. That being said, just use a DC voltmeter and put one lead on either side of each fuse, starting with the maxi fuses. With everything off, any fuses with a voltage drop have current flowing. Once you find the culprit, figure out what circuit it is and go from there. If you suspect the alarm, start there for sure.</p><p>Couple things to remember, The network will need some time to power down completely, (This can take up to 15 min in some cases) Also, every time you pull a fuse or open a door, the power down starts all over.</p><p>To find max allowable drain, take the reserve capacity of your battery (its in min) and divide by 4, the number is the max draw in milliamps.</p><p>(120 min reserve =30ma max draw) That one is from GM service info, but its a good guide all around)</p><p>Hope that helps.</p><p>Cheers![ATTACH]1738036[/ATTACH]</p></blockquote><p></p>
[QUOTE="L-Bronco, post: 16731504, member: 203053"] Hi, The most effective way to track down a parasitic loss in a car is by measuring the voltage drop across the fuses. If there is current flow through a fuse, the voltage on the supply side of the fuse will be slightly higher than the protected side. (A fuse uses a bit of current while its load is on, and it warms up a little. If the current gets too high, it will melt. That being said, just use a DC voltmeter and put one lead on either side of each fuse, starting with the maxi fuses. With everything off, any fuses with a voltage drop have current flowing. Once you find the culprit, figure out what circuit it is and go from there. If you suspect the alarm, start there for sure. Couple things to remember, The network will need some time to power down completely, (This can take up to 15 min in some cases) Also, every time you pull a fuse or open a door, the power down starts all over. To find max allowable drain, take the reserve capacity of your battery (its in min) and divide by 4, the number is the max draw in milliamps. (120 min reserve =30ma max draw) That one is from GM service info, but its a good guide all around) Hope that helps. Cheers![ATTACH]1738036[/ATTACH] [/QUOTE]
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Tracking down a parasitic draw
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