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BMW 3-Series (E90 E92) Forum
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How to test for electrical drain?
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| 08-03-2014, 07:52 PM | #1 |
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How to test for electrical drain?
What the hell am I doing wrong here? I have been fighting with this mysterious battery drain that kills a 100% charged battery over night
 So I went out and bought a multimeter and un-hooked the negative battery terminal and hooked one lead to the negative battery terminal and the other to the chassis wire. It then reads 12.6V I pulled all the fuses and that reading does not change. Please help 
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KW V3's / AA Stage 2 Supercharger / Catless Mid-pipes / AA Mufflers / Apex Arc-8's / PFC 09's  |
| 08-03-2014, 07:57 PM | #2 |
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Major
 
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You need to measure the amperage not the voltage. Make sure the car is asleep.
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07 335XI (A008006) 6AT ~94K miles JB4 G5 ISO VSRF DP's
09 135I M (VK80379) 6MT. Race Project car. 1) Install Cobb/piggyback? and Motiv 600 Kit[HTA3076R w/ tial .82] 2) JRZ or Moton suspension. 3) Build high flow intake manifold with multi-port fuel and relocate OFH 4) Build full cage 5) Complete staged twin setup with HTA4205R [w/Tial 1.16] 6) Complete dry sump system |
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| 08-03-2014, 08:32 PM | #3 | |
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Lieutenant
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Quote:
 there must be some trick im not getting here
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| 08-03-2014, 08:50 PM | #4 |
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Major
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Well you want no amp draw but if you have a parasitic drain that kills a battery overnight it should be picked up at 10amps. What happens when the car wakes up/4ways on you get a draw then?
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07 335XI (A008006) 6AT ~94K miles JB4 G5 ISO VSRF DP's
09 135I M (VK80379) 6MT. Race Project car. 1) Install Cobb/piggyback? and Motiv 600 Kit[HTA3076R w/ tial .82] 2) JRZ or Moton suspension. 3) Build high flow intake manifold with multi-port fuel and relocate OFH 4) Build full cage 5) Complete staged twin setup with HTA4205R [w/Tial 1.16] 6) Complete dry sump system |
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| 08-03-2014, 09:49 PM | #5 |
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subscribed.. i have had a draw also. im so scared to even let my car sit without the BMW smart charger because it has caused the ignition interlock twice now and that is a PITA.
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cp-e GTX3071R TT kit, cp-e quad exhaust, cp-e fuelbar, Stage 3 LPFP+lines, AEM EFI, Custom Meth kit, Apex EC7 18s w/R888 295s, Stoptech, M3 front, m-sport rear, cp-e difuser, Custom Headlights, CFS Radiator, Custom OC, 1000hp Lvl10 trans, DSS Axles, MFactory LSD, DEFIV lockdown kit, M3 refresh kit, KWv2's, cp-e project "4doorbmwpower"
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| 08-04-2014, 11:31 AM | #6 |
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You have to set the meter to measure amperage and pull the fuses one by one. And note any drop in amps. If the amperage drops when you pull a particular fuse then the circuit associated with that fuse is the culprit.
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