We are expecting high 20's tonight and I was thinking about running my engine lights to keep the bilge warm while keeping the batteries on the chargers. I hate to go throught the process of draining the engines or running antifreeze - especially since it was in the high 70's last weekend and this only happens a few times during the winter.

yeah, it'll work.

Those bulbs don't have a long life span so don't count on em for too awful long. 2 months, tops, if they are new.

I also live in austin. will just draining the blocks and exhaust be good?

I have hung 2 drop cord lights into the bilge with 100 watt bulbs to provide warmth. 2 incase one burns out. You can remove the drain plug to check for light to see if the bulbs are still burning. Note: lights will not last all winter running 24-7. This also doesn't provide warmth for the drive if any water is left in there.
Russ C.

Last year I used a timer set to come on about 4-5 PM and go off at 6-7 AM. Mines in fully enclosed so even it the temp is cold during the day, the heat from the sun keeps it warm enough inside. Of course this is in North Texas too.

go to local home supply center and get one of the oil filled radiators they are cheap insurance and no exposed heating element

I wouldn't think the engine compartment lights would be enough,, what are they like 25 watts ?? I would run a drop light with atleast a 100 watt bulb, and yes drain the block.

Do two drop lights.
One for insurance.

Drain the block and the exhaust manifolds (if applicable).

You can skip the antifreeze if you do the rest.

I live too far north.

This was an issue for me two months ago, and I won't be out of the woods until April.