I made my own on board glow driver with micro switch attached to throttle servo to actuate at 1/4 throttle or less, & separate on-off switch. When I got it all finished even a "D" cell would not make the plug red. I used 22 guage wire for entire setup. After confirming with meter that all was good, I put 2 "C" cells to make 2.4 volts. Switch works great now & plug glows nicely. My question is will this voltage burn up the glow plug? Left it on for about three mins with no problem.