Air compresseor problems..

Outlander XMR1000 2014 40hours. Stock

When I first got to the bike the battery was dead.

I hooked up a battery charger, and the guages started moving up and down, like when you turn the key to "on". But now the guages are moving without the key in.
I can also hear the air compressor running. Still no key in!
I thought this had to do with battery not charged.

I unscrewed the negative battery wire and let the charger on.

When indicated battery full I put the wire back on. The compressor starts to run immedeately still with no key in. But the guages seems normal. When I turn the key to "on" the guages does its normal "check" and I can start her up.
All this time the compressor is running. it doesnt matter which setting 1-6 I am on.
After a while when the pressure is to high I guess there seems to be a blow off every 2 sec. or so.

I disconnected the battery again, and dont know what to do. :th_smiliefrustrated

There are no fault messages on the guage.

Anyone have a suggestion, or do I just leave it at service?

Thanks…