I had to jump my Cummins this morning (batteries are dead)and haven't started it in a few days. Fired right off and smoked like a semi lol. But to answer your question I wouldn't ever use ether,I've heard of guys melting positions,runaway engines, etc. I'm not saying doing it one time will hurt it but I wouldn't get in the habit as stated above. First things first though get your batteries tested,if their bad get them both replaced at the same time!if that doesn't help then you can start testing relays and plugs. Heck you can do the relay first. Can't remember how you check it though sorry.
I had a 99 powerstroke and I to had to plug it in or cycle the key 2-3 times in cold temperatures until I did some diagnostic and determined glow plugs weren't working properly.it you get to where you need glow plugs buy motorcraft only.
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