car is a 2002 x type

Have installed just because of age and preventative measure:

New Jaguar positive battery cable
new Jaguar negative battery cable
new cable from battery to fuse box
new battery

Everything was great until I put a new stereo in from Crutchfield--used their harness--now the battery light comes on about once a day *only* when you plug the usb cable from my iphone into the stereo....

Alternator was charging but now I am wondering...anyone else ever seen this problem?

 

Ya typically that's an alternator issue, but on this car it seems that what I think it normally should be indicated by lights its typically not...lol

 

Like others here, I found the positive cable to be scalding hot, when heavy loads were applied.

I turned on the air-cond, the high beams and the rear running lights, plus cranked up the stereo. Within a few minutes, the battery voltage was down to 12.0V and the positive cable was 300 degrees and climbing (at the crimp from cable to terminal lug)

Fixing that solved my battery light issue.

 

Hi cujet - how did you fix the issue? I am having the battery light issue as well. All things seem to check out fine - alternator, battery, etc. If you turn the car off the light goes off but after starting back up and driving a bit the battery light comes back on. Bizarre - mechanics cant find the problem.