Originally Posted by
Shamrock20
What I have Learned
.......the battery on an E86. This did not start until after the 2006 model year.
.......Intelligent Battery Sensor (IBS) on the ground cable. This was not used until after 2006.
Just to make sure no one gets confused, yes BMW started most of what you have stated on most models of vehicles in 2006.
The E85 and E86's did not get updated with this newer technology....
Just to reiterate, NO BMW Z4's (E85/E86) from 2003 to end of production in 2008 have battery registration...
Something to help you out.....
Alternator voltage regulator
The rectified voltage generated by the alternator depends on the electrical load and the engine speed. A regulator system is required in order to supply the electrical loads with a constant voltage. The alternator voltage is normally controlled to values between 13.5 V and 14.5 V. Large changes in the current load of the alternator (major loads cutting in or out) can cause the voltage to temporary deviate from this range. These swings, however, must not exceed 1 s.
Battery charge indicator lamp
Terminal D+ is replaced by an isolated electronic terminal 61E in alternators with a multifunction controller. The task of this terminal is, on the one hand, to activate the battery charge indicator lamp and, on the other hand, to indicate to the various loads that the alternator is in charge mode.
The battery charge indicator lamp itself is supplied via terminal 15 from the instrument cluster. It comes on when the voltage at terminal 61E is below 1.5 V. The battery charge indicator lamp goes out when the voltage at terminal 61E is above 8 V.
Alternators with a multifunction controller can be recognized by the plug connection of terminal 61E. As a result, the 6 mm threaded stud has been dispensed with.
The indicator lamp lights up when:
Ignition on with engine stationary, alternator does not charge, failure of belt drive, interruption in excitation, controller overvoltage, break in charging cable
The second cable in the plug connection at the alternator is terminal 15 that serves as a reference signal for determining whether the alternator is charging.
Load Response Function, Alternator Voltage Regulator
The alternator current changes abruptly by switching major loads. This load results in engine speed fluctuations when the engine is running at idle speed or at low speeds. In order to prevent this disturbance the load response function of the alternator limits the power increase at low engine speeds as engine operation is particularly susceptible to disturbances at these low speeds. The current increases at a rate of approx. 10 A per second at engine speeds below 1000 rpm. An unavoidable side effect of this function is fluctuations in the brightness of the headlights at idle speed.
The load response function is not active at medium and high engine speeds.
Fluctuations in the brightness of the headlights at engine speeds above 1000 rpm are an indication of a faulty voltage regulator.
Start Load Response Function
The start load response function prevents the alternator already supplying current during the engine start procedure. This results in a slight mechanical resistance for the starter ensuring improved starting characteristics particularly at low temperatures. .
The start load response function prevents the alternator generating current for up to 2 s after starting the engine. As a result the alternator current increases at a rate of approx. 10 Amps per second.
The starting characteristics can be severely impaired if the start load response function fails.
You all never seem to have enough time to do the job properly the first time, but you always seem to find the time to do it a second time......... ME
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