Hello all i have having trouble with my glow driver. Is it possoble to burn out glow plugs? it seems that i plug my glow driver in and my gauge reads good on the amount of power i am putting out then the engine starts. ( was tuning an engine lots of starting and stopping. ) the second time my glow gauge on my field box won't come off of zero? So i changed the glow plug and started over. Once again the first attempt to start worked good but the second nothing what is going on? Also how do you tell how much compression your engine has?

Thanks

Flyboy76