Despite a modest increase in sales last year, Mitsubishi Motors earnings took a tumble during the most recent quarter. Bargain-basement pricing and rising incentives took much of the blame. But it hasn’t helped that the automaker has a miniscule product lineup that leaves little for dealers to sell. Company officials now hope to tap allies Nissan and Renault to help add new products to help put Mitsubishi back on the radar, especially in the critical U.S. market.