AI Error After LiMa Switch: Troubleshooting Guide

Hello,

bei meinem Golf 3 TD Variant BJ 98 (Motor AAZ) war die Lima tot (möglicherweise wegen zwei Tagen notgedrungen mit defekter Kupplung fahren - Ausrückbolzen war durch die Druckscheibe gebohrt, Kupplung trennte nicht mehr und ich musste mit Anlasser anfahren und ohne Kupplung schalten. Geht übrigens mit Gefühl und Erfahrung problemlos ohne unangenehme Rückmeldungen vom Getriebe). Ist mir zunächst nicht aufgefallen, weil seltsamerweise die Ladekontrolle bei laufendem Motor aus war, bei Zündung und stehendem Motor aber korrekt leuchtete; es war aber keine Ladespannung an der Batterie, obwohl das Kabel Lima-Batterie OK war (unter einem halben Ohm), und der Anschluss Erregerspannung und Tachosignal bis zum zweiten Stecker am Anlasser auch OK war. Ich habe dann nach der Kupplungsreparatur eine 90A-LiMa grundüberholt eingebaut, lädt einwandfrei mit 14,3V (als und neu sind von Varesa, keine Bosch, vorher war 70A drin). Asubject:

After starting the engine, the oil pressure warning light blinks continuously, and the tachometer remains stuck at 0. When the accelerator is pressed, the tachometer suddenly comes to life, briefly jumps to its maximum reading, and then functions normally, while the oil pressure warning light turns off. Afterwards, everything seems to work correctly, but this irritating behavior repeats every time the engine is started. More recently, it has also occasionally occurred while the engine is running (mostly at lower RPMs, such as when idling, but also while driving). The ground connection to the engine block is okay, and the alternator does not have its own ground cable.

"Does anyone have any idea what might be going on? Before the clutch failure, the instrument cluster was working perfectly fine, no problems at all."

The alternator's internal excitation system kicks in at higher speeds. Before this point is reached, it requires external excitation (voltage from an external source). In the past, this external excitation was provided by the conventional light bulb in the alternator warning light. When that light bulb burned out, it caused the problem you're experiencing.

In the later solutions using an LED indicator, a resistor was connected in parallel with the LED, providing the necessary current. If this resistor failed, it would also cause the same error symptoms you are experiencing.

At higher speeds, the alternator can also enter self-excitation mode without external excitation.

Therefore, check if the wire leading to the control light still provides +12V (when the ignition is on) even with the alternator connected. If not, then something is wrong there (possibly in the instrument cluster).

Greetings.
Sure, here's the translation:

"Guste" is a German word that means "gust" or "gust of wind." It can also be used to describe a sudden burst of something, such as laughter or anger.