Do you know where the coolant loss is coming from? How many miles is on your supra? You could check for a frothy oil mixture from the dipstick or oil cap or there may be blowby in your radiator, or you may be able to see the problem outside where the head meets the block. If you see any of these symptoms, or worse, a combination, it's a most likely you have a blown headgasket. As stated in this forum before, it's not a question of if it's gonna blow, it's a question of when.
Your battery may not have a charge strong enough to turnover the engine but still may have enough juice to power your lights. I've heard cylinder #6 is a favored place for them to blow, that's where mine did. The night I blew my HG, I test drove it the next day and I think that put my car to bed because thereafter I couldn't restart my vehicle.
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