Hello everyone,

I am trying to diagnose what may be the issue on my 2002 Jaguar S-Type as the battery keeps dying every now and then, I changed the battery recently as I thought it was the problem unfortunately it didn't solve it, I did a battery leakage test but it turned out to be fine.

Note that sometime the car works for several days with no issues.

 

What sort of test did you do exactly?

Look up threads on here on quiescent current as they are what you need.

 

Here you go:

https://www.jaguarforums.com/forum/s...-drain-123535/

 

I don't know what the exact name is but here is what I did:
Disconnected the negative terminal while keeping the positive connected, took a voltmeter put one end on the negative terminal and checked each fuse that I could reach to see if it would drain while the car is off.

 

Thank you I will check it out

 

In the first month and a half of purchasing the new battery the car worked with no issues but then started to drain the battery

 

I checked it and in the part that he talked about his friend's car, he said that even after the new battery was placed the same problem kept happening but that is not what happened to me, what might be the cause.

 

That won't work. Worse, it can make things look good that aren't and bad that aren't. Follow the threads mentioned.

 

That wont work, you need an ammeter. A multi-meter wired in series using the amperage lead connections is needed. You will need to be careful not to have anything on the car cycle as you add this (you want a low current range to check for current draw). If something like the fuel pump or central locking cycle, you'll blow the meter up (most meters will have an unfused 10amp setting).

 

As advised, you will do well to follow a systematic approach, as set out in our write-up which JagV8 pointed to and Karl has linked. Read all the posts because there are several handy hints beyond my initial posts.

Cheers and best wishes,