[Bartruff1]

Mine (SP2811) is always reading negative and will go further negative if the fans are on. The local Ford Performance Dealer checked it out and said (or maybe I heard ) that the battery is fully charged and the alternator is charging normal. He said that gauge was in line and it was not unusual for a Amp Meter to read negative cuz if the battery is fully charged the voltage regulator will stop charging and so the system will draw power from the battery ??? I don't know if that makes any sense or not. Years ago, before the Japanese started making motorbikes we had to ride British Bikes and the Lucas electrical systems were a joke.....makes me think a bad gauge, anyone else have this situation ??