Battery drains

JOHN SAVOT

MEMBER
2000 JAGUAR S-TYPE
150,000 MILES

Battery discharges in a short time. Battery test good. Small spart when removing a battery cable. When testing using a test light is it necessary to remove 1 fuse at a time or can a row of fuses be removed and replace one at a time if the test light goes out - to find fuse with short circuit.

Tuesday, January 18th, 2022 AT 6:26 AM

3 Replies

SQM

MECHANIC
6,383 POSTS

Hello,

To find what is causing the fast discharge of the battery or parasitic draw. You will have to use a multimeter to check the current draw as you are removing the fuses. On this test you are looking for excessive amperage drain.
It is recommended to remove single fuse, to help isolate the issue.

Take a look at this video, it goes over the steps:

https://youtu.be/z5F7WpgjaRs

https://www.2carpros.com/articles/car-battery-dead-overnight

Let me know if you have any questions.
Thank you.

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Tuesday, January 18th, 2022 AT 6:49 AM

JOHN SAVOT

MEMBER
2 POSTS

I removed the battery positive cable and pulled one fuse at a time then connected the test light to the battery positive and probe to ground to check if the test light was on or off.

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Tuesday, January 18th, 2022 AT 7:57 AM

SQM

MECHANIC
6,383 POSTS

To find the current draw you will need a multimeter. That will accurately tell you which circuit is the issue. Refer to the video link if you have not already.

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Tuesday, January 18th, 2022 AT 8:52 AM