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Battery ground fault troubleshooting
My battery is dying after 2 days of no usage. The following is what I did to troubleshoot. Please let me know if you see anything I didn't.
Installed multi-meter in series with battery. Steady state shutdown load on battery (SS S/D) ~130ma. Expected normal SS S/D current draw ~25ma. Started with 860ma immediately after closing all doors. Lowered to ~197ma after ~25 secs Began pulling fuses, one at a time. In the engine compartment, driver’s side fuses 43-65 • No current reduction when pulling fuses under hood (43-65). In the cockpit, driver’s side fuses 21-42 • Immediately after opening door ~990ma • With the computer display off ~814ma (~176ma load by computer display) • After pushing door button, to simulate door closed, the computer display off ~792ma. o With door button depressed, simulating door closed, load didn’t lower to expected SS S/D voltage. • Pulled 30a fuse #21 (central & convenience locking, mirror heater & adjustment, power windows, remote boot/trunk release, driver seat adjustment, switch illumination) from 814ma to 720ma 94ma. • Pulled 30a fuse #22 (central locking, mirror heater & adjustment, power windows, passenger seat adjustment, switch illumination) from 814ma to 738ma 76ma. • Pulled both fuses 21 & 22 from 814ma to 644ma 170ma o Individually pulled, fuse 21 & 22 add up to load when both pulled. • With fuses 21 & 22 pulled, closed door from 795ma to 644ma 19ma load from door open. • Pulled 30a fuse #29 (driver seat adjustment, steering wheel adjustment) from 644ma to 600ma 44ma • Pulled 30a fuse #34 (passenger seat adjustment) from 600ma to 555ma 45 ma o Fuse 29 & 34 similar in load. • Installed fuses 21 & 22, leaving fuses 29 & 34 out = 725ma, door open & 705 door closed 20ma load from door open. • With fuses 21, 22, 29 & 34 pulled = 555ma total load from all 4 fuses ~259ma. • Pulled 15a fuse #41 (airbag warning lamps, automatic heater system, A/C blower motor, central locking-interior switch, hazard warning flashers, heated rear window, rear head release, switch illumination) from 555ma to 514ma 41ma. • Pulled 7.5a fuse #42 (airbag warning lamps, instrument cluster) from 514ma to 114ma 400ma • All fuses installed, except 42, with door open 138ma; with door closed 116ma (again 22ma due to door open) In the left side of the boot (trunk area) • With the trunk closed 116ma; with the trunk open ~200ma ~84ma cycling trunk release light. • Pulled 25a fuse #9 (Convenience locking, dome lights, switch illumination) from 200ma to 100ma. o With trunk closed, no change was observed. • After reinstalling fuse 9, battery load remained at 100ma. • All fuses installed and doors closed ~130ma load on the battery • Battery disconnected voltage is 12.11vDC at 1730. |
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