Hi All, My first post here on Motobrick so please be gentle :-)
Bike is BMW K1100LT 1993 (probably ex Police bike).
Background. I bought a handful of these bikes from a friend. This is the first to be looked at.
The first job is just to get this one running in basic mode. The first identified issue is this.
Problem: Discharge of battery while engine is idling (or on slight 'choke').
It is fitted with a brand new charged battery (correct spec). It starts fine. Runs fine (idles etc). After fiddling with it for a while, while it was running, I went to restart it. Battery was dead. Short story is that although the 'Battery Charge Light' goes off, putting a voltmeter across the battery terminals shows a steady drop of the battery voltage.
For the heck of it I removed the alternator and give it a service. Cleaning brushes, rings etc., even though the indicator light implies it is fine.
Digging around a bit more I found that if the ABS control unit is unplugged, the discahrge issue completely goes away and the alternator charges well.
So....As I am no electrical genius and new to these bikes, any help would be appreciated in how to further diagnose the ABS fault (causing battery discharge).
Thanks in advance.
