04 Z4 Won't Start

[Roman]

I had a same problem an hour ago.This is what I did: I turned off my front lights and my cabin light.Then turned the ignition key and after 3-4 seconds of jumping and growling my Z4 came back to life.

[Z-4CE]

I had the same problem and replaced my battery, works great now! When I looked at the battery, the status indicator was green, in other words don't trust it!
2003 3.0 Sterling gray, black leather, 6 speed manual.
Hardtop for the winter, Sport, Convenience and Premium packages, Xenon, Hoen H11 driving lights, CDV delete, Alutec and ACS strut bars,Goodyear Eagle F1 GS-D3's.
Dinan stage III software, High flow throttle body, High flow intake, Ram air intake duct, Free flow exhaust.

[Penguin]

The "Magic Eye" status indicator on auto batteries only shows the condition of one of the six cells, i.e., it assumes all six cells deteriorate at the same rate. My experience is that a battery reaches the end of it's useful life as a result of one or two cells deteriorating much more than the others.

The best test is a load test, but the easiest is to measure the terminal voltage after the vehicle has sat with the engine off overnight, and then to measure the battery voltage with the headlights on and the engine off.

A google for "auto battery voltage test" will give details of how to interpret the results.

[Unregistered]

have the key tested. the dealership replaced my starter and 3 days later same issue as before, they ordered a new key because the old one was not charging anymore or rather would not stay charged long enough to hold the car data and would no longer start the car.

[ZeattleDave2002]

Goddammit people - the thread is FIVE years old and he probably started his car by now and doesn't need any advice :/

[Unregistered]

2003 Z4, had just replaced the battery 1.5 weeks ago, car sat for about a week, bad rain storms the past 2 days. Now car won't start, no indicator lights come on, multiple clicking heard from engine, window keeps coming down a little each time and clicking heard from door (window motor). And trunk light and top indicator lights flashing when have key in the ignition. Tried to jump and those same lights just flashed more.