I have a rider with a 1996 Linamar 790 (Onan p220) engine.
The battery was almost 10yrs old and when the engine was running the ammeter would normally read "0" unless the lights were in use. Every so often (lights off) the ammeter would read +"10" for a minute or so, but very seldom. The old battery died this winter and was replaced. Now when the lights are on, and the ignition is in the "on" position with the tractor not running, the ammeter reads -"10" and when the tractor is started the ammeter reads -"7.5". With the lights "off" and the ignition in the "on" position, the ammeter reads -"2.5" and once the tracter is running, the ammeter reads "0".
Is there a charging problem or is this normal? I do not own a multimeter. Thanks.