Never heard of them before.
Just in case you don't have it...known issues and service manual
Quote:
Technical Issues : GV1200 Madura (85-86)
BRAND : SUZUKI
MODEL : GV1200 Madura (85-86)
CATEGORY : Street Bikes
TECHNICAL ISSUE DETAILS
These models all have a permanent magnet battery charging system, consisting of a stator with three output wires, which feed into a regulator/rectifier. This unit rectifies the AC into DC and regulates this DC to 14.5V to ensure proper battery charging. The output from the regulator/rectifier connects to the battery through a main fuse. Common faults in this system: 1) Regulator/rectifier failure. The OEM regulator/rectifier is a commonly failing part. 2) Stator failure. The stator fails regularly. Causes are age, heat and vibration. Test and replace when it tests bad. We recommend using the fault finding chart. This guide will help you diagnose the charging system quickly.
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http://www.suzukimadura.no/Norway/im...nersManual.pdf
http://www.suzukimadura.no/Norway/im...viceManual.pdf