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Use REDTOP for normal engine starting where an alternator immediately monitors the state of charge and provides energy to the battery whenever it is needed.

This would describe most stock vehicles, including automotive and RV under hood starting, heavy equipmentwhere startingthe primary function, and diesel vehicles without aftermarket electronics.

Use YELLOWTOP when electrical loads are higher than average, or when the discharge cycle is more than typical engine starting such as vehicles with multiple electronic accessories and vehicles without alternators. This can also include vehicle with a lot of factory electronics such as power sliding doors and a DVD player. Examples also include: racing vehicles without a charging system, dedicated drag racers, diesel-powered vehicles with aftermarket electronics, and vehicles with inverters, winches, underdrive pullers or other accessories.