Malcolm Subban improved to 20-9-3 on the season and now has a league-best 2.16 goals-against average and .932 save percentage. Jordan Subban has 10 goals and 36 points in 50 games, which moves him into the top-10 in OHL scoring for defencemen.
Hayden Hodgson scored the lone goal for the Otters (16-29-8), who have dropped eight of their last nine games, and Devin Williams made 32 saves in defeat.
Belleville went 2 for 4 on the power play while Erie failed to score on four chances with the man advantage.
Elsewhere in the OHL, it was: Oshawa 4, Niagara 2; Peterborough 3, Sault Ste. Marie 2; Plymouth 7, Owen Sound 3; Sudbury 3, Mississauga 2 (SO); Saginaw 5, Barrie 3 and Ottawa 8, Windsor 5.
At Belleville, Ont., Hodgson opened the scoring for the Otters at 10:25 of the first period, however, Graovac replied with two goals in 48 seconds to give Belleville a 2-1 lead after 20 minutes of play.
Both clubs had 15 shots in the second period, but neither team could score.
Subban made it 3-1 at 14:36 of the third and Quine added a late goal to round out Belleville's scoring.
Generals 4 IceDogs 2
At St. Catharines, Ont., Scott Laughton scored the winning goal 1:08 into the third period and added two assists while Tyler Biggs scored twice as Oshawa (30-19-4) doubled up the IceDogs (25-25-4), who have just two wins in their last 10 games
Petes 3 Greyhounds 2
At Peterborough, Ont., Andrew D'Agostini made 40 saves and Nick Czinder scored the winning goal, and added an assist, as the Petes (18-29-7) edged Sault Ste. Marie (29-20-4), which lost in regulation for the first time in eight contests.
Whalers 7 Attack 3
At Plymouth, Mich., Tom Wilson scored two goals and added two assists while Ryan Hartman had four assists as the Whalers (27-16-9) beat Owen Sound (33-16-4), moving them over the Sault Ste. Marie Greyhounds for first in the West Division.
Wolves 3 Steelheads 2 (SO)
Spirit 5 Colts 3
At Saginaw, Mich., Eric Locke and Garret Ross each had a goal and three assists while Jake Paterson made 37 saves as the Spirit (26-21-6) downed Barrie (34-16-2) for their eighth win in their last 11 games.
67's 8 Spitfires 5
At Ottawa, Sean Monahan scored three times and Joseph Blandisi, Brett Gustavsen and Brendan Bell each had a goal and two assists as the 67's (15-34-4) beat Windsor (22-24-7), which is now nine points out of the final playoff spot in the Western Conference.