wow. well this is sortove common sense but considering your a n00b ill help you![>:]
well, ok here i help you. you put a new glow plug in and it still wanst lighting. what makes the glow plug light?? hmmmmmmmm. what connects to the glow plug hmmmmmmmmmmm. the wire.
never mind
the wire is bad, and you can get a new one for cheap, but probably will break again, or take the wire completely off your car all togather and get a D cell size glow ignitor. and BOOM let there be nitro smoke upon you!

Have fun!