Originally Posted by 4Knights
IMHO, it doesn't matter if I know it's continuous duty or not, as long as when I have an alternator failure or dead coach battery I can push it and start the vehicle I'm good. Replacement at auto zone is $14.00 so if that's all it costs to replace when it burns out I'm thankful.
If you have an alternator failure on a gas rig, you aren't likely going to even notice until the chassis battery is nearly dead. At this point, the aux. start button would start/restart the engine - but the engine will stop soon after you release the button. There'll be no power available to supply the ignition or any other accessories - like the fuel pump and injectors.
BTW, if you do burn one out, replacing it with another with that potential would not be a very good plan. Get one with a continious duty cycle. They can be found at or near the same price, using the same chassis, making it a straight bolt in. I used to use the ones sold for electric snow plow pumps for instance. I'm sure there are many other applications as well.