I have heard that the filter lite on my 1981 BJ42 serves several functions?Wish I had an owners manual. Does it lite up if Alternator is bad, low oil pressure,low or no brakes [fluid],water in sedimenter?
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As far as I know the filter light only indicates a full sedimenter or a fault with your charging system (bad alt, slipping belt, etc).
The brake light indicates the parking brake is set or your brake fluid is low.
EDIT: I don't think there is any warning light for low oil pressure; that sensor simply shuts off the engine.
no multifunctionality to this. It means the float in the sediment filter has risen from the water and needs to be drained
Also note that NZ spec is NOT AUS spec. As a boneheaded American I once would have made this mistake, but no longer...