Battery Issue?

[CoryM]

Originally Posted by IllusionX

Someone can prove me wrong, but your engine is always spinning the alt, so it shouldn't tax your engine when you use more electricity. Although, it might produce less amps at low rpm, that's why when you turn on electric components in the car, engine will rev up a little as current draw increase, but will not affect engine output like AC does.

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Yaris alternator at max amps will use around 2bhp. Not much, but the Yaris doesn't have much to spare. The only time I have noticed electrical draw affecting performance was driving a loaded Matrix over the mountains. With the A/C converter on, the car would power out and drop a gear. Turn it off and it had just enough to hold the higher gear.

If there is a large, very noticeable difference the OP may want to look into if his lamps are drawing power from a safe source. Or if he is losing current at something important (like the ign coils or similar).

Cheers.