I've always used the glo ignitor plugged in to my field box powerpanel, puts out 1.5v, but has a 12v, 7AH gel cell to draw from. Never had a problem(besides blowing an occasional head).

Maybe some of the more experienced 1/2A guys could help more... try in the 1/2A area?

Only thing I can think of like I said in my PM to you, is to make sure the wires or clip aren't getting shorted - in effect shorting the battery.