Hi
For the igniter get a 1.5v flashlight lightbulb and stick it into the end of the glow igniter and if it glows brightly your good to go, and if it glows dimly charge the battery, I used to carry one in my nitro tool kit just for that purpose, As for the glow plug if the igniter has a good fully charged batter then the glow plug should glow brightly, and if it glows dimly it's at the end of it's life, it will still work but not very well.