my t-maxx wont start. how do i tell if my glow plug is bad? and what else can it be. i need help trouble shooting

To tell if the glow plug is bad you need to take it out of the engine and put the glow starter on it.. if it glows its fine, if it dosent its broke. To help start the engine make sure you prime it enough (check to see if fuel is going through lines) and charge glow start.

If the problem continues and it is not the glow plug your engine could be flooded from rich carb settings. Try leaning out the high speed and low speed needle by turning them counter-clockwise in 1/8 increments.

turn the needles clockwise to lean it.

your question is just too broad to provide any help at all.....what have you checked? are your batteries charged,,,,is your fuel fresh,,,are you using a glow ignitor? is it charged? are you using the blue wire attached to the glow plug? is it broken?

I could go on and on but you get the point if you want some help you have to be a little more specific than "it won't start"