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March 6 (Bloomberg) -- General Motors Co. plans to reinstate 661 dealers and may enter arbitration with as many as 400 outlets as the biggest U.S. automaker attempts to stem declines in domestic market share.

GM offered franchise agreement letters to the dealers, North America President Mark Reuss said yesterday in a conference call. The company has about 5,500 outlets.

“We are eager to restore relationships with our dealers,” said Reuss. “The arbitration process creates uncertainty in the market. Issuing these letters of intent is good for our customers, our dealers and GM.”

The Detroit-based automaker is trying to increase U.S. sales and market share while trimming four of its eight brands. Chief Executive Officer Ed Whitacre named Reuss, 46, to the post in December in a shuffle of top managers.

GM accounted for 19.9 percent of U.S. sales of cars and light trucks last year, a drop from 22.3 percent in 2008, according to Autodata Corp. in Woodcliff Lake, New Jersey. Ford Motor Co. beat GM in monthly sales in February for the first time since 1998.

The dealer reinstatement plan “is a good thing,” said Maryann Keller, president of Maryann Keller & Associates in Stamford, Connecticut. “There were false economics in terminating that many dealers. If they restore what they’ve lost and put back into business dealers that were financially viable, then they will gain sales.”