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Old 07-05-2020, 08:00 PM   #1
Lewis Long
Registered User
 
Join Date: Jul 2020
Location: Trabuco Canyon,
Posts: 5
ANOTHER parasitic battery drain problem

I've been through past threads, watched YouTube videos, and talked to friends, with no luck.

Car: 1998 Boxster, ~110k miles, 5 speed, no heated seats or alarm.

The battery drain completely drains a brand new, fully charged battery in two days. (I have replaced the battery.) The multimeter reads at 12.83 volts, so the battery is healthy.

A multimeter between the negative post and ground, with all accessory lights (front and back boot, door markers, overhead) off, shows the car drawing about 3.5 amps. Two different multimeters gave the same reading. Based on available data, it should be drawing from 70 mA down to 30 mA after the ignition is turned off.

I have pulled each fuse to locate the offending circuit, but with no effect; the draw stays constant. I do have a aftermarket stereo with two external amps, but I disconnected both amps for the test; no change. The head unit is on the existing fused circuit.

What am I missing? Is there a separate set of fuses, breakers, or relays not run through the primary fuse box in the driver-side footwell?

Any help or suggestions will be much appreciated.
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