To make myself clear I am refering to wire required to ignite the glow plugs from a 1.5 volt source which in my case is 8 700 ma batteries in parallel. A small drop in voltage = great loss in amount of heat at the plugs. The battery is used to start the engine only. I have no glow assist on my planes. The Mc Daniel system uses 4 batteries in series and electronically sends higher voltage in pulses to the plugs thus not needing such thick wire. -Tom