My glow indicator light has been inconsistent. When it does come on the car starts. If it doesn't light up the engine will crank for 5-10 sec before starting--even if the key is kept in pos. # 2 for at least 20 sec before attempting to start. It's strange that it worked this morning at 30 F. Then after parking the car for a few hours, no glow light. After searching the forum I found that the 80 amp fuse should be checked for any bends. However, I got a nice spark when I took a phillips to the screws. Should I unplug something first?